Over debited account and telkom cannot rectify their mistakes

Case number ***6 : I took out a Fibre contract which was supposed to be R399 on the November 2020 deal. Telkom accounts department confirmed that they used the wrong code and my account was debited for an amount of about R2200. I visited telkom baywest and they could not rectify their mistake. I contacted telkom telephonically and they logged a query during the first week in January and was informed that they will refund the amount which was over debited . I contacted telkom again today and nothing as been resolved.. The consultant informed me that my account will be debited with an amount of about R700 this month.... Telkom is quick to debit but cannot resolve a query which was initially caused by telkom staff.. CASE NUMBER ***6.