Replying to Bad mount?

So I took my new skis to get mounted at sports chalet (unfortunately its the only place to get it done within an hour and half of my house) and unsurprisingly, they did a terrible job. All of the screws are fine, except for two of the screws on the heelpiece are threatening to pull out just by hand flexing the ski. My conclusion is that the guy's hand must of slipped or something caused the hole to be a bit too big.

In short, the heelpiece is threatening to pull out just by a hand flex.

I was thinking, being the big corporation that sports chalet is, I could badger them into refunding the purchase price of my skis.

What do NS?