Debited a wrong amount on my account

I app**** for DSTV price lock in September, their consultant called me to discuss everything. She explained that on price lock I will pay R549 for 24 months and that include the following: Dstv Compact fee, Dstv Explora,free delivery and installation and absolutely no increase on fee for 24 months as per their advert. Then she told me that because I've already paid R365 on 22 September for my compact, it will serve as a pro-rator and on the 22 October they will debit +- R300, I was surprised on 22 October when the debited my account the amount of R747.83 . Then on the 23 October I contacted them to seek clarity, I was told that the information I got before the installation was incorrect, I told them that it was not my fault and I need my money back because I didn't budget for it because their employee gave a wrong information. The lady said they Will listen to the call and come back to me but even today I'm still waiting.