Incorrect billing without Invoice or Statements

I have a 5 Gig contract with MTN @ R 270.00 / month , Capped at 5 GIG for day & Night use .<br> I have been disconnected for more than 2 weeks now , and went to shop to find out what is the Issue , well according to MTN I am in debt for R3600 , for two month use , and after asking for invoice and statement since last week , NO Reply from them to date.<br> As per normal I gave them all details to open the account and RICA ( proof of address ) and they did not change on new contract , my 2 gig contract ended in July and opened 5 gig in August .<br> I have 2 different ref no from them , but no use as they do not give me any feedback on this .<br> why must I pay R3600 for their incompotance for not capping the contract , and the best is that I used 2 gig till the 25th of the month , and let it ran out for the remainder of the month , and now I am suddenly using R3600 of data for doing the same every night ( facebook & You Tube )