Disgusting customer service

We purchased a fridge from Game on the 16th February which was delivered on the 17th. Whenever the compressor kicks in it makes a high pitched noise. I called Game and they sent a Defy technician to look at it. He said that he can't see anything wrong with it and it's the gas making that noise because it is a small fridge. We are obviously not satisfied with that explanation. I have since contacted Game numerous times as I want to return the fridge. They are doing nothing but giving me the runaround. This is not a "change of heart" as we firmly believe that there is something that is wrong with the item. I have never experienced a fridge making a noise like this and find it unacceptable that Game Gateway has done absolutely nothing. Surely I have the right to return goods that I am not satisfied with?