UNABLE TO RETURN LOGIK ICE MAKER

I've purchased a Logik Ice Maker at this Game store end of 2015 on my Game Card and asked whether the card can be used for returns, because from past experience, the slips fade before the guarantee expires. I went to the Returns counter today, and asked to return the ice maker because it indicates that the ice is full and therefore doesn't make more ice. I provided my Game Card, and was told that they can't see anything on it - they sent me to the credit dept to obtain a statement. The Credit dept told me their phones doesn't work and can't help me. She walked with me to the returns desk and asked them to call for a statement. They simply pulled up their shoulders and said that they can't help me - phones off. When asking to speak to Management, they were not at the store. After a mega tantrum from my side, I asked for the complaints line number, and was told if I want it I must get it from another desk. When I started to Google the nr, they suddenly said I could leave the Ice Maker, copy of my card and ID and they will contact me. If you can't see what you sold me on my GAME credit card, then why should I pay for it? Worst Service ever, and I'm still without an Ice Maker...