Samsung microwave faulty

My microwave stopped heating on friday. I took it to baywest game as it was originally at moffett on main where I bought it. It has a 2 year guarantee! I have the original packaging. I went Saturday to baywest game where Shanel couldn't track the microwaves serial number. She said I couldn't leave it and had to come back on monday. I phoned on monday and spoke to Janine - she also couldn't assist me. I can't get in touch with Gordon Kemp. This is frustrating - I need assistance ...