WORST EVER

I went to Game Greenstone mall today at about 11h30. I had bought a Garmin GPS from Game about 4 months ago and now it started giving me problems and it won't charge anymore or switch on sometimes it even makes weird loud noises. I couldn't find my slip from the purchase but since I bought it on my account I thought there would be no problem. Got to customer service for assistance and Dineo assisted me (not that it was anywhere near assistance) what terrible service. I explained to her what the situation was and she was no help at all. She told me that since I don't have my slip she cannot assist me. I told her it shows on my account and all my statements so we can use that as proof. She talked to me like I was stupid and did not even try to assist me further or tell me how we can go about solving my problem. I work in sales so I am on the road the whole day and I drive anywhere so I need a GPS. I am so disappointed in how I was treated and that my issue was not solved. I cannot be without my GPS for 3 weeks so they can try and fix it. It has a 24 month warranty and now Dineo tells me if they cannot fix it they will also not refund me??? I don't think she should be dealing with clients at all. WORST SERVICE!!