Pathetic service

I have cancelled my mtn contract 1 month ago and since Monday 31/08/2020 I have not been able to receive incoming calls. I have been to an mtn store 3 times this week to resolve this issue but still the staff are *********** enough to resolve my issue. On the 03/09/2020 I visited the Gateway store after not getting much help from the Phoenix Plaza store (which I had visited twice). I spent approximately an hour waiting for my issue to be resolved. The Manager (Melanie) assured me that she would contact me later on the 03/09/2020 but has not done so , I have tried to call the store numerous times but there is no answer!!! Still I am trying to resolve an issue which is a fault of Mtn!!! ABSOLUTELY PATHETIC SERVICE FROM MTN!!!!!!!!