Replying to Shop messed up my mount, what do I do?

Today I had my brand new JJ zeros mounted, and asked for 2.5cm behind dead center, but when I got home, realized they mounted them 2.5cm behind the factory recommended line. I don’t want skis drilled twice, and I feel that I was very specific in that they should be mounted where I asked. Really feeling the regret now in not drawing a fucking line myself. I don’t want to shit on all shop techs, but when you hear “xcms behind center”, do you mount behind the recommended line or actually measure the ski? I didn’t waste a fucking grand (norwegian VAT sucks) to get a set of skis drilled twice. Sorry for this rant but I really feel that the shop fucked up.