Banking details not changed resulting in charges.

I contacted the telkom mobile call centre in June with regards to changed my debit order banking details. I asked whether the debit would take place at the end of the month from the new account. She said no as a full month needs to be given, BUT if you make a manual payment it will reflect and from the following month (August) the new account would be debited. I made payment on the 14th July via eft. On the 16th (a day later that the agreed upon debit date) my old bank account was debited. For the last month I have been contacting call centre agents to sort this out. A lady called Katie asked me to send her my bank statement and proof of payment so that she could send to accounts department for them to credit me the debit order fees (which I REFUSE to pay). I waited for my new statement thinking that the amount would be credited. It wasnt. Contacted the call centre back only to be told none of my calls had been logged AND my banking details have never been changed! I AM HORRIFIED! The old bank account has been closed, I want to be refunded the debit order fees and changed to a manual payment. This needs to be sorted out AS A MATTER OF URGENCY!