Unhappy with Telkom's Service

I made a payment of R2307 to Telkom to settle a contract on 3 June only to realise a month later after receiving an invoice that my payment was not received because Ref No. that the consultant has given me was incomplete. By end of June, the contract was cancelled and the number changed to prepaid. I was debited the R249 monthly installment on the 25th of June as well as R1350 on the 25th of July for cancellation. I called Telkom a number of times to reimburse me the R2307 but to this day, I'm getting a run around regarding my money.