Misled by the OnAir tv agent

I curse the day I answered the call from OnAir tv. I was misled by their agent who told me that the R259 includes the Dstv monthly subscription. After receiving the decoder I contacted multichoice to activate my decoder, the agent from multichoice told me that I am going to pay their monthly subscription separately. I'm expected to pay the R259 for OnAir and the R329 for Dstv. I am currently not using the decoder from OnAir since I can't afford to pay this much monthly. I asked them to collect their decoder and they told me that the 7 days cancelation period has lapsed. When I contacted them regarding the misinformation from the agent they told me that they listened to the recorded calls and I was advised by the agent that I'll be paying the Dstv subscription separately which isn't true.

I missed the payment last month and I received messages from them informing me that the missed payment is going to affect my credit history. Now I have to pay R259 for 20 months for something I'm not even using. This is a *******.

I'm also asking myself how OnAir tv got my information. When they contacted me they told me that since I am using the old decoder it's time for an upgrade. Only multichoice has that information. I really hope that multichoice isn't sharing our information with these people.

I want to terminate this contract asap.