Cancelation request - no assistance from on Air

I requested my account to be cancelled on the 27th of July, one month after the request, still no feedback. When on air called me to take up the contract they said that the apps can work without an active DSTV account. When we recieved the product, and installation we realised that the apps can not be used without an active DSTV account. So we can not use the device at all. After informing on air.... We are still struggling to get this contract cancelled. Do not know what to do. Their customer service after care is non existing.