Parents got screwed by Geek Squad; is there any recourse? (X-post from r/AskReddit -- here is better)

Hi guys. Posted this to /r/AskReddit but then realized that this subreddit exists!

My parents just called me and told me the following:

• Their computer got a Trojan virus, so they took it into Best Buy (without telling me first; I would've screamed, "No!").
• Geek Squad asked, "Would you like to backup?" and backed up only the Administrator account, so everything on all the other users got wiped.
• All my stepdad's personal files are gone.
• They owe Geek Squad $300.

I don't doubt that Geek Squad will just hide behind the service agreement, which I'm sure covers loss of data due to incompetence as well. Is there any recourse, though? Could Geek Squad admit its mistake and cut them some slack? Could Recuva work to recover the files?

Eh, the answer's probably no. Let's just gripe about how Geek Squad fools people who aren't computer-savvy into thinking there's more to basic tech support than just Googling problems.