Sorry about your luck, I would send it back and kindly ask them to fix it AND give the rest of the rifle a good once over before they sent it back as that type of work is unacceptable regardless of how much you paid to have the work done.
I had 2 issues in the past with gunsmiths, one handled it very well and I would have work done there again. The other didn't seem to think there was anything wrong with the sub-par work performed, needless to say he will never see another one of my rifles again. Live and learn.