Debit order incorrectly debited

I was a Nashua Mobile Client and MTN has taken over my contract. I cancelled my Data bundle with Nashua Mobile and my debit order was reduced. Since I went over to MTN, they are debiting the old debit order for my data bundle and I don't receive data.<br> When I called the help desk fro MTN, I held on for 13 Minutes, spoke to the a gentlemen: Nyo Moja and he said that Head office will have a look into my account and correct the debit order ammount, I told him that I want this to be a compliant and he said that he will escalate the matter to his 2 I C, Themkosi Khumalo, he said that I will also received a Compliant email from Khumalo on 2015/03/23, I am still waiting? I expect MTN to give me all my data that they owe me for debiting the wrong amount.<br> I have also updated all my details on the MTN site as well as with the call centre, I want my statements emailed and not posted. I updated my email address and my physical address and still the statement is being posted and the address is still wrong, how long does it take for MTN to fix the mess they have made, why could they just continue with all the info that received from Nashua Mobile.<br> *** & ***