Replying to My terrible very bad no good mounting

I'm an east coast skier, so I spend all most all my time in the park (which itself is fairly shitty as it is in upstate ny). I got a pair of volkl walls on a clearance sale and brought them to my local mountain to get mounted, and then....disaster struck. I got them back, skied on them for a week, and then realized that one ski was mounted true center as I had asked, and one was mounted back two and a half inches. Surprised and infuriated, I brought my skis back to the skop, giving them clear instructions to remount them at true center. I come back the next day to pick them up, and now both skis are mounted back, the exact opposite of what I clearly asked for. I brought them back AGAIN AGAIN, and am resorting to calling the mounter/manager of the shop because he did an absolutely rediculous job on my skis twice. The tricky thing is, they already screwed and filled holes for center mount on one ski, which implies they would have to predrill and put threaded screws in, which I've heard just cant handle the kind of pressure big jumps and freeskiing apply, not to mention the shitty side affects of having your skis mounted THREE times. I'm wondering what to do, if I should hold them accountable for the destruction of my skis and make them pay for a new pair or not, Im not sure. Either way though, soooo shitty.