Who's fault is it???

[allmotorX]

Im not going to name any shops or names and im not flaming or trying to disrepect by any means!! So ill get to the point few months ago i drop my car off at a reputable shop to get some work done. So after the work was finished i paid through paypal and i actually paid alot more than what i owed because i was being greatful for the shop working with me. So i get to the shop crank up the car runs good idles fine no problems so far. Well while on the way home few min down the road camshaft locks up, which causes the timing belt to twist the cam gear off ruining it completely. Well went back to the shop and they had the car towed back to the shop which was only a few min away. Then once they took the head off come to find out it locked up in #2 journal. So i take the head to machine shop the first shop told me that i would need a new head and cam(keep in mind camshaft is smack brandnew) so me being hard headed i took it to another machine shop and they told me the same thing the cam cant be fixed and i would need a new head. So i get a new head and then i send the cam off to get repaired two days later(today) i get a call saying i might as well buy a new chamshaft. Long story short im pretty much out of a head, a camshaft, and camgear. Which adds up to about 600+. Also i had to pay for the new head and work done at the machine shop so in all im outta of more money than what i was actually suppose to be out of. I just want opinions on who you think should pay for a new cam, and camgear. And who should have paid for the head work at the machine shop? all opinions welcomed