Telephone marketing - Misrepresentation

Received a phone call from On Air TV informing us that our HD Decoder will be discontinued from 2016. Offered us a deal for a Explora with Extra View for only R169.00 per month extra. I explained DSTV already offered us a deal for a explora. They asked how many decoders we have and we explained a PVR, HD Decoder with extra view. They explained then we will have 2 Exploras with extra view for R169.00 extra. After installation we phoned DSTV to activate the exploras. They confirmed that our subscription will now be R1760.00. No where near R169.00 extra more than about R800 extra. On Air TV was phoned on the same day 11 June 2015 and I asked them to remove their equipment and bring my old HD Decoder back as what they offered and I received was not the same. I also phoned the installer but they received instructions not to remove the equipment. Only once did I receive a phone call back telling me they are still investigating. Every time I phone Nadia is on leave or she tells me she didn't receive any feedback. I even cancelled by Email on 12 June within the time stated by the Consumer Protection Act. Please help as I can't get any action from them.