MTN supersonic is super *******

I've been experiencing extremely poor connection for months now - it definitely is not supersonic, it's slow, it drops all the time... I've been reduced to creating a mobile hotspot on my Vodacom phone just so I can work, complete online meetings, etc. I've upgraded my line from 10 to 50mbps and that has not helped. I was also refused a new router when I did the upgrade because the one i had was apparently "good enough". I've called the support line on a number of occasions only to be told to disconnect all devices and reconnect again which doesn't solve anything. Then I wait 48 hours for a technician to just call and tell me "it's showing as connected on our side"... they can't be bothered visiting my house to do a proper assessment. I've even bumped into technicians doing new installations in my estate and they refuse to come have a look. Honestly, life's too short for a super ******* promise of connectivity from MTN - you're better off with Vodacom LTE/5G.