MTN bad customer service (Musgrave Durban)

I am highly disappointed with Mtn Musgrave branch in particular, it's been 3 months, 2 months have paid for contract and have not received the correct data, it was an upgrade for blackfriday special. First was told device was looking for not available because my number was supposedly on the old system and needed to be migrated, I had to wait for a week and no one bothered to contact me I had to visit the branch more than 3 times which was ridiculous. I couldn't take it and decided to settle for whatever package I could get with data and I needed a device immediately, the supervisor was the one who assisted this time because the consultant was no help and clueless. Was told I would get 21GB with my package, it's been 3 months been given the run around, no one bothers to call still, case was logged by supervisor *** it was resolved still no data. I had to top up, I have been more than patient with mtn I honestly fed up! And worst I have to keep Goin there myself no one bothers to call, now they have given me promo data, told me they will need to cancel the contract and redo it, it's been another whole week no one has contacted me.