New customer invoice system unacceptable

After being a customer for over 10 years I am bitterly disappointed in the service I have received from MTN. Tuesday 19 May I received an sms about a new and exciting system. Not so. 20 May I received an SMS to say sorry we double debited your account and will pay it back. 27 May received an SMS to say my payment method had changed to cash....After all these years and never missing a payment I did NOT change anything. 2 June received an sms to say my order had been dispatched. WHAT ORDER???? 2 June received "hate mail" about being in arrears with my account. YOU GAVE ME MONEY BACK REALLY!!! I was given 10 days to pay....oh quickest 10 days ever because my services were disconnected before I even got the email about the account being in arrears. Tried to make a payment.....so before going onto a new system perhaps you should have updated CAPITEC that the reference character limited needed to be changes as my account number has changed and now I still cannot pay because CAPITEC (not your fault) will not allow the new account number or any of my cellphone numbers. Chatted to the team on messenger (really patient people and the only reason this review is a 2) I will have to make a manual payment. REALLY so whilst I am staying home because I am high risk i now need to go out to sort out the stuff up made by MTN and make a manual payment because even the app which is highly promoted IS NOT WORKING and i cannot even pay through that. Really MTN this is not on. Test a new system before you go live with it YOU STOPPED THE DEBIT ORDER!!!! YOU GAVE ME MONEY FOR I DO NOT KNOW WHAT!!!!! YOU HAVE NOT ENSURED YOUR NEW PAYMENT SYSTEM AND ACCOUNT NUMBERS ARE WORKING!!!! Not me. Not in over 10 years have I once defaulted or queried a payment. I use the service I pay for it.....now i must go sort this out. To send me a notification to make payment or be suspended AFTER you have suspended my account I am working from home. Well not today or tomorrow I guess till this can be sorted out. Do you now get my bill for money lost, risks taken, petrol to sort this out, business lost due to not being able to call clients???? Do you require a VAT number on that invoice :-(. Come on guys sort out your system please. Great you got a new customer invoice system, not so great that clearly this does not work. And perhaps you could send me this order I supposedly am getting or perhaps the instruction to switch my billing to cash? yes no maybe????