requesting refund since May 2015 - poor servise

I settled my CTM account in May 2015 and after which there was an overpayment of R336.93 to the account. I called the call centre advising them of the amount and the process for the refund and to also to close that account.I submitted the email with all the documents and I was advised it takes 14 days to obtain the refuund. No one provided feedback and I kept on enquiring and everytime I provide the same details.the emails do not contain a signature therefore there is no one to contact.all I'm requesting is the R336.93. They keep asking the following details of which I've supp**** multiple times.<br> <br> 1. A letter requesting the money to be paid into your banking account. <br> 2. Your banking details <br> 3. A copy of your ID document <br> 4. The proof of the last cash payment made and the bank statement reflecting the last debit order transaction<br> <br> Please help, I want my money back with interest earned over the past 3 months.<br> <br> Regards<br> Annah