MTN contract dissatisfaction

I have a MTN contract and since day 1 I have paid my account. Today my account has been suspended because they say I am in arrears. I have sent numerous emails with proof of payment and bank statements. Still it hasn't been fixed.

I called MTN customer care last week and they said my account isn't in arrears the amount ahowing is for this month and next month. I called again today for them to tell me I am in arrears again. I have to send the proof of payment once again.

I am frustrated as now I can't do anything on my simcard. I will not be taking out a contract again when I upgrade if this is the service that is being delivered.

I am very disappointed at the level of service delivered.