Let google know they're up to something fishy. Say something to the effect "I Suspect they are" or "It appears they are" - don't outright accuse them. ( Accusations are always bad, unless they can be proven. You can't prove it, however Google can. )
My competitor? They disappeared altogether from the Google rankings within about 2-3 months of me complaining. ( About 6 months later, they slowly creeped back in ... on the 2nd page. )
You may also let Google know that they're a spammer squatting on a trademark of yours. Remember, GOOGLE is a private US Company with their own interests, if your name is your trademark (either registered or implied) you have some weight there. The convoluted way our laws work, bringing the situation to their attention can potentially make them involved. So, they'll want to cover their backside. Make sure you look into "reporting a trademark complaint" if you're doing that with Google.
Last but not least - If you haven't done so already - look into registering your trademarks with USTPO like my company did. A trademark registration certificate from the USPTO - is a one ton hammer you have at your disposal. You'd be surprised how effective it is. Get a general idea how to write a C&D letter, and you can put a stop to lots of things. ( Oh, a heads up for you & your accounts-payable - ignore all the junkmail scam bills you'll start getting after registering a trademark. Ugh. So many scammers trying to sell you "trademark monitoring service" after you register. )