I never used CoinRoyale website so far, I don't think they are active in Bitcointalk forum, and I can't find if they have any betting license, if that is the case don't be surprised that something like this happened.
You should read terms on their website and if they have some rule that can terminate your acount for being dormant for years than there is nothing you can do about it, and there is nobody to complain about your problem.