I' m sorry about your balance getting removed in CoinRoyale. As Ash and others have mentioned, according to our TOS, the funds in the dormant accounts are subject to removal, especially if the account is more than 5 years old. In addition, the email asking for the funds doesn't match the email of the accounts, which we definitely can't do it. We have emails coming in almost every week 'claiming' he/she owned the 'accounts' and asked us to send funds out to the address he/she provided. It's a textbook tactics by scammers and our team are very aware of it.
That is a pretty bad business practice in my opinion, deleting dormant accounts are not the best thing to do,you could've backed it up before deleting especially if there are funds in that account, that is basically taking someone's money away, you could also use some kind of verification of the owner to prevent scammers you know.