Oil Pump problems of the 2003 Chevrolet Cavalier

I purchased my 2003 Cavalier brand new with 106 miles on it (it had to be driven from pittsburgh to harrisburg). In late sept. Or early oct. My car began rattling at stop lights. The day after the rattling started, my car stalled at my place of business and wouldn't start again. A triple a mechanic was called and couldn't determine what the problem was except he thought it was the fuel pump. After having the vehicle towed to a garage, I was told that oil was not making its way through my engine causing friction and in turn causing my engine to expand breaking my timing chain and basically rendering the entire engine useless. The mechanic asked me if my check engine light or oil light was lit on my dashboard because with a problem with the oil pump, one of those lights would have lit up, which I responded no. He then thought that the dashboard lights were not functioning which was not true because when he turned the key, all the dashboard lights lit up. He then went on to tell me that my oil levels were normal and that my timing chain should last for 25+ years. The mechanic went on to explain that I should contact Chevrolet because he believe that with the low mileage of my vehicle and the relative new-ness of the vehicle, the only cause for this issue would be a defect. I contacted Chevrolet via email and was told that I would receive a response in no more than 48 hours. After hearing no response, I filed a complaint with the bbb and still have not heard anything.