Yikes!!
My two cents: if in doubt, seek legal help. You did the right thing.
I, first hand, have had to deal with IP issues...coming from the other side, I have had people doing business under my business name...even using my website as their reference material! Trademark attys are VERY expensive, but will save you in a crisis.
Again, I can only imagine your concern but I think you did the right thing!! Glad it was just a scam and not legit!