No disclosing or info to the client

I bought a DSTV decoder with free installation. Phone the installer and they installed the dish. Now the installer phoned me after 2 weeks and said that i must be a new subscriber to DSTV. I phoned Game helpline and the person in a rude way told me to read the T&C. The paper is inside the box so you need to buy the box and then read it. The consumer act says that you need to make sure your client understand the conditions. I just feel Game needed to say to me before i bought the product that i need to be a new subscriber. I want Game to train their staff and phone the installer to sort out the problem that i am facing.