I'm not trying to defend xcoins here but it's clearly stated in their Privacy and Policy page -linked in op- that they have the right to collect their customers personal information:
If you wish to use any of our services, we will collect and retain certain relevant data of yours, including some of your personal information.
Personal information in this instance is defined as:
Personal Identification: Full name, date of birth, age, nationality, gender, signature, utility bills, photographs, phone number, home address, and/or email.
Formal Identification: Passport number, driver’s license details, national identity card details, photograph identification cards, and/or visa information
Right now, the best thing to do is to send them the documents so you can withdraw your money. Not sure if this is still possible after they banned your account, though.