Ever gotten money back from a machine shop?

Two of my experiences:

#1) Sent a chevy 350 pick up motor to be rebuilt by a well-known, reputable, highly recommended business. Did not know the place had actually changed hands. Got the pick-up back (they removed/replaced the motor also) and it had very low oil pressure. Sent it back and they found the oil pump was not torqued down.
#2) Built my own 273 bracket motor at community college. After I graduated, I went to a local shop for machine work to help with a refresh/rebuild. I assembled the motor at home. Before initial fire-up, when I was filling the radiator, it kept taking more and more and more water. When I checked the oil dipstick, I found it was way over the full mark. Pulled off a valve cover and found water shooting up from beneath a valve spring. When the machine shop machined the cylinder head for dual valve springs, they went too deep and the spring pressure broke right through the spring seat. Don't remember anything regarding "refunds", this was back in the 70's.