billing complaint

Hi. my account has been paid an amount of 1527.80 on 02/12/2015. Because this was a late payment for the month of November 2015. I was again debited 2667 on 18/12/2015 which meant that i was being billed for November and December. After i had already been billed for November on 02/12/2015. I have been calling the call center and have been told that my 1527.80 was now credited into my telkom account which i specifically said that i would like the money refunded into my bank account. i have waited now for 4 weeks for this and called the call center countless times and no one seems to know when this will happen. every agent i speak to including the call center manager cannot assist me. I need someone to assist its really ridiculous now. case numbers ***6 and ***6