Replying to Screws pretruding through base of my skis?!

When a friend mounted my skis, he fucked them up and overtightened them, causing the screws to push the base of my new Elizabeths out. The bumps are pretty gnarly, and it really pisses me off cause I love these skis and I have only ridden them 4 days. He works at a shop, but he did them for me for free. I really don't know what do about it. I am going to try and talk to the shop tomorrow with my mom, but since I didn't pay for the service I don't think they will help. He mentioned hammering the bases back down, but that sounds super sketch to me. You can't stretch something out then hammer it out. The material that got pushed up would have to go someplace, plus once the right sized screws are put in, the holes would still be to deep. What should I do?