SAMSUNG S6 EDGE R150per month

I saw the advert on the internet, for the Samsung Galaxy S6 egde. at R150 per month including R150 airtime per month. I printed the deal out and i printed the termns and conditions. I went to Cell C greenstone mall, where they tell me that \it was a mistake"and the cannot be held to fulfill this. I feel that this is false advertising and I want Cell C to take responsibility for their actions. If they advertise it at R150 per month they need to give it to the consumer at R150 per month. The only clause in their terms and condition for them be able to decline you this deal is if there is no stock"