I brought a used car from an independent garage 10 months ago with a newly changed cam belt by the same garage. Five months and 8000 miles later the cam belt snapped. The garage has since made a warranty claim on the parts that has just been rejected (seven months later) on the basis that the cam belt was over tensioned. I am told by the garage that I either appeal against the decision or pick up the bill myself. What are my options now?