mRiches Casino Complaints

ok so i joined this casino and made a £100 deposit i won £2000 and had lots of contact from casino congratulating me and asking for me to submit my passport bank statement and copy of card i used etc all fair enough though they waited 4 days after my request to ask for these and then another 3 days after submitting to the n email me informing me my withdrawal has now been cancelled due to me years ago excluding myself from a completely different site called kerching and that they also closed my account and will not refund any payments i have made. Can they do this?