MTN is debiting more money from account

I logged a complaint a month ago and MTN called me back to resolve the issue. But after they have assured me that the problem would be sorted out, i got debited for the contract i cancelled twice again.<br> <br> My brother's contract ended in February, I asked that it be cancelled. I continued to be charged for it and when i logged the complain, you refused to refund me, but assured me i wont be charged for it anymore. But last month and this morning I got smses showing you have taken more money than required from my account. Please bring my money back????<br>