Discovery Card changed the rules without telling

I bought an iPad at the iStore in Fourways on 21 October - I spent R 8,198 and was told by the consultant in the store that they were a Discovery partner. I received my statement to find out that I did not get my cash back reward. When querying this with Discovery they say that they are no longer iStore partners. I queried it with the store and they claim that they did not they weren't partners anymore - and Discovery did not communicate this with me either now so I am R 984.00 out of pocket. If they had told me then I would have gone to Incredible Connection where I would have got the same item at the same price and R 984.00 cash back. ******, ***** and *******!!! Don't trust hem and don't believe anything they tell you - rather sign up with EBucks or UCount or some other company that actually honours their commitments. Disgusted!