Online purchase

Purchased a Tv online and received the wrong TV set which was cheaper than the one I ordered. I have since requested to exchange the TV in store for the one I ordered. But now I am told I cant, as a purchase from Game online and in store is different even though this is the same organization. When I called customer care to return the item I was promised a call back. The second time they hung up. Third time I was also promised a callback. I feel de*****ed and no one is willing to assist at Game. Pathetic service for my first online purchase