Disgusted with Mtn's cust service / ***

In Sept I signed for 2 top up contract phones in New town MTN and the agent advised me that for the 1 phone Z30 I will have to call in the next day in order for them to cap it, and I did exactly that, as time went on I used the free R100 airtime I was given and loaded airtime on my phone under the impression that the airtime that I'm using is my prepaid airtime, then I noticed that even though I did not have airtime but I could still make outgoing calls I therefore called MTN to check what's happening only to learn that they have already billed me an extra +-R500 for both the phones, I queried the billing I spoke to Steven Selana and I explained my situation and he referred the query for investigation under *** and we agreed that I will have to pay the R477.90 for both the contracts as per contracts and I was to stop the debit order with my bank, I paid R500 cash and went to my bank to stop the debit order unfortunately they could not stop it, the d/o went through on the 27 Oct for R901.90 I have been asking the agents to refund the amount they debited R901.90 as I had d/o's that were to go through on the 30th Oct but my voice was not heard & the refund is not done yet.