Contract cancellation

I wrote to hellopeter last week to get my contract cancelled and I received a response from Alice Van Der Merwe with reference number : ***. To my surprise this morning I received an sms from MTN saying I owe them R114 after I was told by MTN on the 11December 2015 to make payment of R413.44 which I did and they confirmed that it reflected on their side the 17/12/2015 but now they want another payment for what. When I called MTN I specifically said I don't want any dealings with MTN anymore and therefore don't want MTN to debit my account nor transfer data on my phone anymore but MTN went ahead and put data on my phone on the 20/Dec and I called them again to advise that I don't want this data and they must take it back because I'm not going to pay for it when I said I don't want any services from MTN again. Will I ever get this account closed and my name cleared on my ITC that I don't owe MTN. I just called MTN and spoke to a Nolitha who didn't want to speak to me and she didn't even want to give me her surname and the best thing she hung up the phone on my ears. Is this the service that MTN gives their loyal customer?