Rebuilt and assembled shortblock 5.7L Hemi

Dropped of a 5.7L Hemi short block to get rebuilt. After I got it back, I finished assembly, oil pan, pump, heads, intake, manifold, etc. Got the engine installed only to have it backfire multiple time through the intake. Took the engine back apart, only to find out that they installed the timing chain on backwards and installed camshaft incorrectly. I corrected the problem and got it running. Called them on Monday and told him what happened, and all I got was "Sorry". He would not refund me any money at all. After a discussion, I realized that they have no clue what they are doing. I wouldn't trust them with my lawnmower. DO NOT USE THIS SHOP !!