Hmm, you can probably try to tell them that you moved out of the country. Just provide proof that you did live in your old address, that you moved out and stuff. Now the problem with this is that if the casino EXPLICITLY says that they don't allow VPN access to their site, then that'd probably do jack about it.

Honestly, a lot better to be straight and just ask them what they can do about it. Who knows? They may just do a little bit of kindness to you. Just that if they said they can't do much, don't hold it to them lol. Pretty sure anyone can see (and judge) that it's clearly your fault.