Unfair claim process

We bought a Samsung 60 Inch TV from House & House which is still under warrantee. Samsung confirmed that the TV needed to be replaced. Maria contacted us and informed us that Samsung do not manufacture the same TV anymore, we need to choose another TV, they will pass a credit for the original R 16999.00. We went to House & Home in December 2015 and the only Samsung 60 inch for sale was marked for R 13999.00. Maria informed us that they have to close our previous account and load all the items again from scratch, our payments will be deducted and the credit processed. When she loaded the TV we chose, she informed us that the TV is on promotion an only R 8999.00. We were quite happy with this. The Manager contacted my husband again in December and told him that we need to buy a TV for the original amount of R 16999.00. I contacted them and queried whether we can take the TV we bought and then choose something else on the floor seeing that they did not have a 60 Inch for the same price. They agreed that we can have the TV we chose, they will process the credit and process the lower amount. When my husband went in to sign, they refuse to charge us the promotion price of R 8999.00.