Oh boy do I have a good story to tell you guys now.
And
TL;DR at the bottom as always, this one is long.
So the Rain guy arrives in the street at just after 12. I see him from the window, he's at the neighbor across the road. Neighbor says their internet is fine and the technician walks to get back in his car to leave.
Luckily I get his attention, and him and the other technician come in with masks (one of the very few positives of this experience). I greet them, show them the complimentary hand sanitizer I put out for them and told them they came at the right time, as the router is showing the exact problem.
The first technician is the one that is mostly involved in the story, there was another technician too and she helped more with the connections and speedtests.
I show them the problem on my phone, which shows the 5G as Unknown in the signal stats, and there's no 5G light on the router. He says it's because of line of sight, and to put it on the roof to test.
He then asks if I have a ladder. Luckily the neighbor lent me their ladder before the lockdown to do some painting, so I had one long enough, so I provide it.
He then asks me for an Ethernet cable. What kind of IT technician doesn't even come with an ethernet cable ?
I provide it.
I then comment on how they are going to power the thing up on the roof.
He then asks me for a power extension.
Luckily I do have one long enough so once again, I provide it.
He then asks if I have a pole (I was about to say yes but it's not something I do in public but rather not haha) and I say that I do not have a pole unfortunately.
He goes up on the roof, connects and powers it, it shows good 5G signal but as I indicated to them, it often shows as fine for a while and then disconnects completely.
He asks if I have a star screwdriver. This is item number 4 that I have to provide *sigh*
He swaps the sim to his test router, it works fine at the top of the roof.
He comes down and we have a discussion. I tell him that since I've waited 24 days for them (my mistake, it's actually 33 days since 31/03) I want them to run another setup for me (as they took some screenshots and I got the feeling they were going to dash and log it as fixed and I would have to wait another month for someone).
I ask to setup my router outside the window close to where I put it normally so it's pointed to the tower in the big gap through the trees (the same gap that is good for about 300-400Mbps when the 5G is working).
When it shows no 5G or bad 5G disconnections, I will keep it connected and hand it to him on the ladder and he can stand on the roof and we can see the signal because if it is the line of sight, I should see in the router stats that it is fine up on the roof.
He now says they're not actually allowed to go up on the roof and he was doing me a favor by going up their to test it.
Uhm. Okay. You're not going yet dude, I will get my dad to help instead.
So my dad goes up, I hand him the connected router which had intermittent 5G again.
I log into the menu via my phone, and I can see the stats show Unknown 5G signal - problem.
A gem of wisdom from the techie is that the dBm in the router menu for 5G is different depending on whether it is a Wifi connection or Ethernet connection. I try explaining that I know Wifi speed is slower than Ethernet but the dBm stat in the router menu indicates the signal from the tower to the router but at this point I just want them to see this bad connection
Technician goes and sees where my dad is standing, he says that is not far enough up on the roof, and he must stand closer to the top. My dad moves up further.
Still no signal. He says that because we left it connected, that's why it's still a problem. I tell him that why didn't the 4G disconnect then. Anyway, I say let's restart it again.
It restarts and shows fine 5G. I say hang on, let's just do one more restart as often the connection goes to crap after a restart and stays that way for a while.
Now I can see he his body language shows he is annoyed I am keeping them there.
Okay buddy, I am also annoyed I waited 33 days for you.
So my dad is patiently waiting there on the roof (thanks a mill Dad, I owe you one) and we are all around the techies laptop connected via an ethernet and I can see on my phone too.
So my dad is high on the roof, the router is now restarted and connected via Ethernet.
The router menu shows the 5G connection has full bars, good signal.
Technician turns around and shows me with a smug look, to show that he is right.
I look for a few seconds. Bars go off. Signal unknown.
The same problem as when they arrived and it was in the window is present on my router high up on the roof.
I point this out to him. I also say that I really think it is the tower that has a problem.
He says he doesn't know now.
Apparently they are escalating again, I ask if they will send an email to indicate when the next technician will come and he replies "Probably" but I can hear he is annoyed that I was right.
I get their names, we say goodbye and they leave
I realize that the guy was in such a rush to leave he forgot his bag here.
Don't have his number either, will have to mention it in the email or wait until he shows up.
Not sure what is in his bag though, it felt like I had to provide most of the stuff haha.
I feel like telling them that I am currently busy during the lockdown and they have to make an appointment to fetch the backpack, and my first open appointment for him is available in 33 days

I kid I kid.
TL;DR : Technicians arrived at the wrong house and were about to leave before I got their attention.
Needed me to provide an Ethernet cable, ladder, power extension and screwdriver. And a pole, which I didn't have.
Also told me that the 5G dBm stat in the router menu depends on whether I connect via Wifi or Ethernet.
After a lot of back and forth testing, first my router on the ground and roof, and their router on the roof, and them mine on the roof again with my dad because they said they are not actually allowed on the roof etc.
They finally saw that I was right, and that the problem happens on my router regardless of whether it is in my window or high on my roof.
Now I send an email and wait for someone else. Noice. 33 days and counting.