Car repairs

My car wouldn't start, wouldn't take a jump. I towed it
to dealership. When you giggled the battery terminals
it made the computer re-up and interior lights and
accessories came on but engine wouldn't start. Saturday the dealership is only open half of a day.
The service guy said the timing is off. What can I
expect for costs of repairing low end to worst case
timing chain? I don't want to get ripped off!
Thanks!