MTN Clawback issue to rob the clients

I took a data contract with MTN in October this year for unlimited data and a router for R295 but when they debit, they debit R350. Fine that was not a problem, in October they debited R63. Which I don't know why, after that I got my service suspended, then I called them to find out why, they told me that my account was in arrears, I then asked to debit those arrears same time which they did.

End of November I got an sms saying they'll debit about R4500+ with no explanation on why was is like that, but unfortunately I moved funds to another account so that they cannot debit that amount, I only left the R350 that I know was my agreed debit. They did debit R350 and suspended my service because they didn't get that R4500+ they wanted.

On the 9th of Decemberi called them to find out why my service was suspend, I was told that they charged me clawback because my debits were rejected, but the first lady I spoke to in October told me that they had problems with their debit system that's why the debits were rejected.

But now they blame that to me as a client. I've been waiting for their back office to resolve the issue as they promise me, but they never even called me back.

I wish I can get this issue resolved. Here is the their BO ref number: BO ***.