NON-RESPONSE TO INCORRECT BILLING

My account has been incorrectly debited by an amount of R5300. I opened the case with Telkom Direct : case The Glen. Three months back I had taken a cellphone contract with Telkom Mobile which I ended up cancelling within 7days due to faulty device and bad cellphone coverage in my area. The device was accepted and I was informed that Telkom does not repair cellphones and in my case the contract will be cancelled. I was informed that because I returned the device in 7days, there was not going to be any cancellation/penalty fees. Two months after on 30/04/2015, my account was debited by R5300 by Telkom Mobile.<br> <br> I realised this on 07/05/2015 and on 08/05/2015, I opened a case at the branch: *** and I was informed that this amount was incorrectly debited and will be reversed to my account in 72hours (at contract cancellation, penalties were waivered. Todate my money is not paid back. A week back I phoned to check and I was infomed that the case is with the billing department and no further information was available for me. Today, 25/05/2015 I am still not getting assistance as to when I am getting my refund.<br> <br> I am fustrated with Telkom and their non-response and refund,!!