Hey iSteve
I feel your pain.
I am experiencing exactly the same issues... Correct speed during day on the line, come 18:00 though, latency on pings go insane. Anything from 500-700ms, I noted 1800ms two weeks ago while trying to play some online games.
My issue has been ongoing with Mweb for 7 weeks (Started 21 September)
The process thus far:
Log a call with Mweb
As per Mweb's request. I test using my FNB Connect account, Mweb account and the Telkom quest account. Same results on all account, so something points to the exchange
Mweb logs a call with Telkom
Telkom advises nothing is wrong with the line and closes the call
Times this process by 3.
Then my issue gets escalated at Mweb.
Telkom comes out and tells me there is no noise on my line and it is generally great, they say that my hardware is faulty.
I explain to the Telkom technician that i have used 3 separate account, tested 2 separate routers and bypassed all wiring in the house so I connect directly to Telkom jack in the wall. The line speeds you mentioned is observed WHILE the technician is there, but they state the line is fine
I do some more test as per Mweb request and send them the results.
Later Mweb advises that they have had my port reset, should be fine now, unfortunately is isn't though
Later Mweb advised something was done on the DSLAM, should be fine now, unfortunately is isn't though
Mweb starts contacting me less about the issue as time goes on, so I post on myBB.
Mweb guy says that he needs my info will follow up.. An advanced Mweb technician/engineer phones be and ask for tracert results. This info is passed on and I never hear from him again
After not having heard anything I post on Facebook
Mweb guy says that he needs my info and I should give him the results for a national and international trace route, both for the times the line is working correctly and incorrectly... This info is passed on, but nothing is resolved.
06 November I post again on Facebook
Mweb guy says that he needs my info and I am still waiting for a phone call.
This is a very long way of saying i know what you are going through and hope you have better luck getting you issue resolved than what I have.
After 7 weeks, a blanket of helplessness and acceptance has settled over me.