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.
Why would they terminate a dormant account, I mean that thing shouldn't be done especially if they are dealing with money. With this kind of thing happening around the Internet and these gambling sites just putting every rule that they think fits their agenda makes me want to puke, I hope that some regulation is going to be put for these exploitative practices.