It's nothing new, in my experience. You got a knucklehead. They have ALWAYS had them at S&W. For the most part the guys up there do pretty good but once in a while you get a hold of someone who must be having a terrible day and he takes it out on you. Doubt much ever happens to them or they wouldn't do that.

Since you paid for the work, I would wait a day or two, call them back and tell them you want to return the gun. They need to fix your gun like it is supposed to be. Their repair work surely is good for more than 90-days!