Account closed after deposits of over £35,000 made without any further information or justification

I have been a member of this casino for some years now and have spent thousands I have had some withdrawals but nothing major. Last month I had deposited over 5k in a matter of days. I then recieved an email stating that they were some advanced checks made on my account and now it is been closed. I've asked them for a reason and when theses checks were done as I think despite making a large sum of deposit and having a few withdrawals. Meant my account is verified now I am 37k out of po and they are refusing to give me any compensation for this.. Obviously now I have no chance of winning any of the money back but I always assumed that there were certain measures in place to protect my money which was spent on this site with no issues whatsoever. As a vip player I thought I would have received better treatment