Incorrect billing no response

I have been complaining for the past 4 months regarding my data Line , I ensure that I actual switched off my data when I was not using my Samsung Table and when that didn't work I actually took my sim card out of my devise and I am not interested in using it again. I have requested MTN to investigate the usage of data and prove to me that I used that data for the 4 below months and I have only to date been advised regarding February and March. I cannot call the customer centre because my account is with legal and every time I call legal I am advised that there is a back log and someone will get back to be we are now in October and no one has come back to me.<br> <br> As a result my top up contract was credited with R200 this month and after an hour that credit was at zero and I didn't use it. I can't call customer care they tell me my account is with legal and they cannot help me and legal doesn't get back to me. <br> <br> MTN is has debited my <br> 20 May 2015 Amount debited R3694.39<br> 20 April 2015 Amount debited R1512.82<br> 20 March 2015 Amount debited R1400.99<br> 20 February 2015 Amount debited R821.90<br> <br> Before February 2015 my monthly debit was inside R850 for all my lines.