Over charging cause I cancelled my contract

My name is Thabiso Motloung, ***,<br> Im really not pleased with MTN right now. I made an enquiry about excessive Data you charged me after cancelling my contract. ( see my query below). Now to add insult to my query you proceed to debit R3139.22, instead of the R369, I pay monthly in my bank account, this is ridiculous. .. Please pay back my money.<br> <br> Previous email Dated 20 May 2015<br> Hey<br> <br> My name is Thabiso Motloung, number in question ***, Invoice date 07/05/2015.<br> <br> I'm really not happy with the above mentioned number (***). The past 24 months having this contract, I have been paying at least R369.00 on this contract. Now that i decide to cancel the contract after it has expired, you people want to charge me more than twice the amount. How did this invoice get to R993.55?<br> <br> I don't accept the R528.92 packet switched data calls.<br> <br> please explain this to me.