Game online purchase - ******* and Unfair business practice

I made an online purchase (order number ***) for the above desk, a computer screen and a keyboard and mouse. They delivered the screen, keyboard and mouse. When I phoned to find out when the desk will be delivered, I was informed that there was no stock. On further investigation, I found out that Richards Bay branch (3km from my house) DO HAVE STOCK. I was then informed that the store that I purchased from do not have stock. I DID NOT purchase from a store. I purchased online with NO OPTION on what store will fulfill my order. Now I was informed that I can purchase the one from Richards Bay store for R1299.00 (When I made the online purchase the exact same desk was on promotion for R350 cheaper). So now I must drive to the store and pay R350 more for an item that I have already paid for so that they can refund me the R950 amount paid. I purchased this item for R950 with free delivery to my door, why can't GAME fulfill this purchase. I am sure that even the most dim witted among you can see that this is ******* and unfair business practices. I will definitely take this further if we cannot sort this out as soon as possible.