Here's a hack. Use the referral header or url tracking parameters to redirect the URL to some place seedy or maybe their competitor. I'm sure they'll change it quick after that.
Since OP thinks it could be a scammer doing it, perhaps just check the referral header and display a big banner stating that listing on Maps is not you and to not contact them and list real services/competitors?
Will stop people from contacting them in favour of real businesses if that's the case.
Eye for an eye is a bad advice when there are more peaceful, not yet tried alternatives. It's not like they are pointed a gun and the only escape is shooting back.
I respect the opinion though, so not down-voting you.
They can claim them but I very much doubt they'd win in court - "we're infringing someone's Trademark and impersonating them on Google and they redirected traffic on their own website and that redirection is harming our ability to fraudulently profit from their trademark" ... kinda like suing someone you murdered because they made your knife messy.
The OP would still suffer expenses defending the messy knife claim in court. If the bad actor has deeper pockets, this would be just one more way for the bad guy to continue being a bad actor
No they can't. I mean they can, but you can literally sue anyone for anything. Doesn't mean you're right or entitled to compensation of any kind, especially in this case. In fact, the owner of the website (OP) can sue the listing "owner" and Google and probably get something, but it's not proportional to the effort and wasted time + money.
I'm concerned that this is being downvoted, and that people in this thread are giving legal advice without any caveat or mention of country, state, etc.