On Air selling false information to customers

I was sold a dstv decorder explora ultra with false information that, I would not need to pay subscription to multichoice, I would only need to pay R259 with access to all services and content available, it comes with a built in wifi that will connect without a need for internet connection, basically no need for data. I can try services if I am not happy with them I can cancel within 7 days of receiving a decorder. I tried reaching out to them via whatsapp, but all I am told is that their agent was correct, if needs be they will have to investigate recordings a process that can take up to 14 days. They can not cancel because I have activated the deorder. I tried to offer buying a new one and send it back before 7 day period, but still no success.