Wrongfully billed - and MTN empty promises

This has started from the 8 October where they have billed my account incorrect. So they have corrected the wrongfully billed but not the vat. So I went back to Hello-peter to get the vat sorted then MTN got back to me with the following "the account was credited R 2850.00 vat was not included. The request is sent to the billing department to add a second credit to the account for R 406.40. The reference number 1- ********** 3370. Kind Regards Alice van der Merwe" this was send to me on the 8 November and it not done. I receive a SMS from MTN Monday the 27.11.2017 that they are going to deduct 2212.40 from my banking account. Then I phoned 808 and was on the line for 2 hours where they could not help. I give them the reference nr as I received 1- ********** 3370 does not exist so I gave them an other reference nr 1- ********** 3354 that I received on SMS and I also receive an SMS stating that the issues has been resolved just for the operator to tell me nothing was done and it was just closed. So this person Nhlahna said he will get back to me with in 2 hours it is now 72 hours later an no one of MTN is getting back to you he gave me a new reference ********** 47 not sure what reference this is but no one got back to me. I am not happy to pay MTN vat on this due to there mistake this is really bad service I am going in to month 3 and this nonsense is not sorted out.