Hey, it happens to all of us. Pretty hard to sue anybody for a generic name like gamesandcasino. I’ve seen people registering various extensions for casinogeek, as well as play on the name casinogeeks.whatever, and I know it’s not worth persuing. Heck, it isn’t even worth getting upset about. Seriously.
Take it as a compliment and be glad you’ve become so successful enough for this crap to happen. 
Microsoft went after windowscasino.com for trademark infringement on ‘windows’, and they lost.
If they can’t win that battle, I doubt it’s worth paying a lawyer for gamesandcasino. Besides, your lawyer may say yes just to bill you some hours. Been done before. 