Misleading contracts

I received a call on the 24th of March 2018 about the Price Lock package which i was offered a contract for an Explora for R119.00 for 24 months the consultant said i will received an Explora Decoder with free delivery and installation with channels included. The package was delivered to me on the 5th of March 2018 i called the installer for installation and after that i called Multichoice to activate the channels but only to find out that the package doesn't include channels, i called them to cancel the contract since i can't pay R119.00 for a decoder without channels for 24 months, my cancellation was escalated to Price Lock since i couldn't get hold of them i had to call Multichoice to call them. on the 12th of March 2018 a consultant from Price Lock called me and she wanted to know my reasons for cancelling the package i explained to her that i was told that i will receive channels with the package only to find out there were not channels included so she told me that i cannot cancel the contract since i have already opened the package and used the decoder but to my surprise there was nothing written stating that once the parcel is opened i cannot cancel the contract she later said she will listen to my recording , i've been waiting for her to call me since monday how can someone listen to a recording from monday until today without getting back to me. What i know is that i cancelled my contract on time. now its their delay i want them to take back the Explora and cancel my contract cause i was deceived in agreeing in something that doesn't exist.