Extremely Bad Service

Termination Date of Contract was 09/02/2016. service suspended 3 weeks in Nov. 2015 and 2 weeks feb 2016 According to my signed contract I was supposed to pay MTN 468.99 pm for 24 months yet as from July 2015 MTN started debiting me 478.99. Please advise how the agreement changed and who authorised the debit change? As per my records my debit was returned on the 1st November 2015 and on the 17th November 2015 I made an EFT payment of R491 to the bank details MTN sent me via sms. MTN could not find my payment and suspended my service after I've spoken to several customer care consultants and emailed the proof of payment to [Email Removed] I finally managed to get some proper assistance from Brandon Balie who assisted to have to service restored. On 2 December 2015 MTN debited my account with R969.38 after I have already paid them the amount due for November 2015 and debited me again on the 23rd December 2015 for R145.32 which did not make sense. The debit for 1 Jan was returned and resubmitted on the 8t Jan. Eight days later another debit of R823.45 was submitted. I made another EFT payment of R834.85 on the 20 feb. and the service was restores for about 2 days and cut again