Sorry to hear of your problems.
I have the same rifle that was rough out of the box-similar to your troubles but nowhere near as bad-responded well to slicking up at the 'smiths.I also changed to Mod 70 style safety-you can accidently snick the standard one on when working a bolt in a hurry.
Get money back or replacement rifle-don't get stuffed around with promises of "repairs"
However,mine is the earlier hog-back version of the 550