Withdrawal denied due to unspecified term

Hello, i played this casino. I have done a lot of deposits. Than I want to do withdrawal request. --506 euro. I was waiting a lot of days. I sent all documents. Today I get mail and request was denied. And casino remove my winnings. Now I have 150 Euro! (i had 506)

Mail:

Dear Ondrej

As part of our regular withdrawal review process, we have seen that the terms and conditions of the casino were not met.

Our Terms and Conditions prohibit placing single bets equal to or greater than 30% from the value of the deposit.

We have therefore cancelled your withdrawal request and removed the winnings.

Should you have any questions please contact our customer support via live chat on our site.

Kind Regards,

Verification Team