Timing belts torn

Hello! I’ve been looking for help or experience on this forum. I have the following problem, driving an Alfa 147, 1.6 16V, is now exactly 3 years and last week I ripped at about 75,200 km of the timing belt! The car has been standing since in the workshop (there I also bought it and regularly inspected it!) and I still have no information what is broken, what it costs and whether Alfa takes the damage or at least part of it. t. Maybe I can get some tips here… ???!!! Greetings and thanks