Expiry of contract

I have had 3 contracts with MTN. When these contracts came to an end I assumed it would be completed. However, these contracts went into a month to month billing cycle, without prior notification.I am aware that I had amounts in arrears payable on these contracts, but being unemployed made it difficult.I was prepared to pay the outstanding amounts, but all of a sudden there were just more costs added to my account.The bill is now standing at R21 000 +- and these are subscription fees taken for month-to-month billing for services not used as my services were suspended and no longer in use.I check my ITC records on a regular basis to ensure all my matters are in order. The MTN account appeared on it as Complete or Paid up. I discovered this morning it is now appearing as outstanding on my ITC record with the above astronomical amount. I want to have this investigated and the correct amounts reflecting which were outstanding due to non-payment and not due to a month-to-month billing item, which was never utilised as the numbers were disconnected. To locate all 3 accounts, refer to ID number below.I would appreciate it if this issue can now be resolved after almost 3 years. Thank you