Indiana - I have a suggestion for you based on what happened with my wife's old Passat...

See if you can get your mechanic to make the case to the warranty company that something other than the t-belt failed, and they may cover the work. The Passat's tensioner pulley assembly came apart and messed up the works. If the belt had broken, it was our responsibility, but since something else caused the belt to fail, it was all covered by her extended warranty - I only paid for them to put a new serpentine belt on when they put it back together... a $38 t-belt replacement!

Good luck!