3 months of useless billing

3 months ago my fiance started having billing problems with MTN, the debit orders were coming off twice and on the wrong day, i went to the Century City branch and asked for it to be fixed, after an hour they assured me it was fixed, the next month same issue, i went again (on the 22 June 2015) to the Century City branch to fix the issue of double debiting and changed the debit order date from the 21st to the 31st and was told they had put a request out for the accounts people to watch the billing of this account and to make sure it went smoothly (***). This month (27 July 2015) it happened AGAIN!!! I went AGAIN to the Century City branch and was told that the account has been changed to a cash payment and not Debit order anymore, but also that the request that was sent out OVER A MONTH AGO hasnt even been opened yet by the billing people!!! And when i asked why nothing has been done i get a blank stare. Good bye MTN, i think the Cell C Contract buy over will fix this issue.