Extremely unhappy customer

I am an extremely unhappy customer and very disappointed with representatives at Game Gateway. I purchased a 198L Hisense chest freezer as well as the 3 year extended warranty on 21 November with my RCS store card. When inquired about stock and delivery I was told there is stock and delivery will be on the next day which was Friday the 22 November and that I will be contacted before delivery however the freezer was not delivered neither was I contacted. I called the store on Saturday and spoke to Sarika only to be told that there is no stock as they were informed by DC 10 units were dented. I was then told they should have stock by the following Saturday however after numerous phone calls and visits to the store I finally received a call from Sarika yesterday the 16th of December stating that they don't have stock. Sarika then stated she can change the Hisense for a 195L Defy and I will have to pay R300 more or she can iusse a refund. I then questioned the logic of changing the freezer for something that is smaller only for me to pay more as well as a refund not being an option as I have already been billed the installment for the freezer she stated that is my only options. I am extremely frustrated at this point as it's almost month since I made the purchase and I'm going to be paying for a freezer that I still do have. The offer that she made is extremely unacceptable as I am not willing to pay more for something that is smaller than what I originally purchased and I need my freezer. The whole reason for the purchase is to have it before Christmas If this the kind of customer service we receive from Game then I would certainly not recommend purchasing anything from them.