Extremely poor service and under trained staff at MTN South Africa!!!

I have been in contact with MTN since August 2022 in which I have been trying to cancel 1 number, due to it being on their old system I kept being told I cannot be helped and I need to email retentions which I have done one several occasions and am still paying for a number that has not been cancelled as no one gets back to me. I have been in to the stores to have this sorted and they too say they cannot help me, they have even tried to help me by taking it to the top and yet I still have no reply. I am now trying to have the accounts migrated to the new system to see if they will help me with that and then cancel the number but lets see what response I get! What a disaster MTN is! We even tried to upgrade a phone number in store on the same contract and then they say it is not possible due to the account being on the old system, yet they phone me around 6 times a week to upgrade! What is wrong with these people!