It bothers me when things like that happen ... Mistakes will happen , but I really get upset out the break in my "plan" .. you have a day all planned out and then ..... this one thing that should not have happened comes out of nowwhere ... and the plan is gone... and frequently the project momentum.
So sorry for your inconvience , I am sure the shop owner will make it right. Hopefully there is enough undamaged on the bolt .