overcharge

I have been a customer of mtn for the last ten years. Currently I have two contracts with MTN, one a top up contract and the other a internet contract(night express). Since January 2015 my internet contract has double, then tripled the follow month, then went up to 8 times more the then the normal contract. I have questioned this numerous of times but I have always been promised that they will come back to me within five working days by the 808 no, customer care line, and the mtn complaints department, but they don't even come back to me. Eventually I stop the debit order cause the charges were escalating and I was not receiving any url report or feedback after I requested it. I visited the branch at Vryheid and I was told that phone calls were made on Internet contract and that I should gladly pay the account. Now I don't have a problem to pay the account but how can I pay for telephone bills on my Internet account since I have the samsung tab 1 and you cannot make phone calls.<br> <br> It will be appreciated if your office can assist me with this problem since MTN is not attending to my problem, cause I need to see the url report and to see why I am been overcharged.<br> <br> Kind Regards<br> Ritesh