I seem to be experiencing something odd.
When I go about on a regular day-to-day using MTN, say about 8~12GB with no Night Time usage, everything is super -- pings are low (18~30ms locally), speeds average in the 30's in the day with a 2 hour slow down during peak hours, and reliability is tops. The day I decide to load something big, around 60~80GB via Night Time data, the next day and subsequent days are abysmal -- pings can be anywhere from 50 to 200ms locally, speeds never go above 4mbps, and it can disconnect often. DSLReports details for me that when speeds reach around 4mbps, a heavy bufferbloat of around 8000ms+ kicks in which brings the speeds down tremendously until a transfer session completes, which suggests throttling, but I've already discussed with both Afrihost and MTN and have been assured that these capped packaged are neither throttled nor shaped, and I believe them due to the nature of these packages.
This issue happened before around a month ago, and for the short while after troubleshooting with both parties to no avail, I switched briefly back to rain on Band 38 which is super in my area (no peak time speed shaping) but unfortunately I couldn't stay on it long due to extremely frequent drops in the network which is dangerous for downloading updates and video calls. So, I was off MTN for about two weeks, testing here and again for an updated situation, and it seems that after a week and few days of not touching it, performance of the service returns. I of course chalked this up to a one time problem, but I did the exact same thing yesterday and lo and behold, my performance today was dreadful. International sites were the worst and I had to get under a VPN just for standard usability to a local server, ping was all over the place etc.
I'll have to monitor if things return to normal in a soon enough manner because this issue can't seem to be resolved given my location with only a single tower. Perhaps I am being throttled for being an abuser on this single tower compared to larger areas with multiple aggregate towers, and this is the best way MTN keeps in check for the town I'm in, which is fine for me if that were the official case. While I don't like the higher price for a capped package that slows down after a night of loading, nothing comes close here for their reliability and rain just drives me crazy otherwise (no Telkom here on the 2300MHz band or I would've dipped toes in that possible path, 1800MHz is abysmally slow as well). Not gonna complain to either party too as for almost everyone else in larger / proper areas, their service is top notch.