MTN Worst service

As a client of many years with MTN, I received the worst experience ever. November I forgot to load money in my account and debit order bounced for the 1 time. I called and made payment arrangements and account paid. December my debit did not go off and I called to enquire and they told me debit order will go off. My debit order went off and after a few days another one went off and came back unpaid. I called to enquire and they said it was an error. There I was stuck with bank charges for unpaid debit order. January I called again and February they stopped my debit order and saying there was unpaids. Now March I called again for debit order to be reinstated and my account was debited. A few days later another debit order unpaid and I called again l, my account is paid up to date and not in arrears and today they suspended it. Cli have been complaining and they not doing anything about it. I'm very upset working from home and unable to make calls due to my phone suspended and my account paid up to date and stuck with bank charges and negative impact on credit report. I can't wait for contracts to end and cancel it.