Absolutely Uselss

Useless! For over a month I've had buffering issues since having to change my simcard from CellC to MTN, I've tried changing settings as suggested, apparently the connnection has been refreshed at least 3 x times, I've spent ages on the phone trying to get this resolved. I was promised 2 weeks ago that the matter would be escalated and I would be contacted. Since then I've called in 4 x times and asked for a Manager, been promised one would call me back but still no call. Talk about useless! I can't even change providers because of lockdown and this is affecting me badly having to work remotely. Will be changing to another provider as soon as I possibly can.