Telkom is a ****!!!

I have a Telkom account and I received my statement in July and Billing amount were incorrect I called Telkom call Centre they told me it was subscription fees which I know nothing about lady I spoke to in July said it will be reversed on the following month. I received another statement in August same thing happened and funds were debited again in my account and I called again same thing they said it will be reversed again now I received my statement for September billing amount its suppose to be around R600 and I'm charged R1000 its been 3 months Telkom is billing me incorrect I've been in Musgrave Telkom branch I did not get any assistance they told me call but I call I don't get any assistance I spoke to Keshnee Nardt she told they don't have a turnaround time for me to get my money back yet it been 3 months. This is *****ulent and I don't want to reverse their debit orders because it will affect my credit score. I really need my money back and I don't have extra money to pay for something that I don't even know. I'm tired of being send from pillar to post!!!