MTN Upgrade impossible

It has been a entire month where we have tried to upgrade my phone.<br> <br> We started 23/9 to change some particulars of the contract. On 1/10 we went to the MTN shop in Centurion Mall where we attempted to upgrade. We spent 2.5hrs there. They informed us to come back as we have to be authorized. This is strange as we have been a customer for the last 10 years. We however accepted it. No one contacted us, so the 3/10 we contacted the shop ourselves. They said all was fine and we could come through. Again we spent 3hrs there. Still no phone the sales rep said she would let us know when we can come and collect the phone. By 6/10 we still had no phone. The sales rep from the mall gave us a phone number to call as she said she was having no luck with the upgrade. We phoned and they said they would deliver the phone 8/10. The courier came with the WRONG phone. We sent it back. It has now been 2 weeks since we sent the phone back. We have sent 2 emails and have made 10 calls to the call center where we were either, transferred to 7 different people, hung up on, waited on the line for 20 min and still NO PHONE!! There is just no way to resolve this problem!