Account Closure and confiscated funds

Created an account on this site a few weeks ago. Made a few deposits and had no issues until I requested my first withdrawal. After my requested withdrawal it took them 4 days to «investigate». My wins of total 82 dollars was suddenly confiscated because of Multi accounting. I knew for a fact that noone in my household or any family member has made an account so after back and forth in Livechat they refered to:

8.4.3.4. Syndicate Betting; which refers to circumstances where Account Holders act together to place a series of Bets on the same event, competition or other occurrence in relation to which the Bet(s) are undertaken. Account Holders should consider that placing Bets on the same event, competition, or other occurrence in relation to which the Bet(s) are undertaken from more than one Registered Account and/or from the same IP address to get better betting limits and/or livebet grace time, may be considered Syndicate Betting. If the Company suspects Syndicate Betting, the Company reserves the right to close the relevant Registered Accounts, reduce betting limits, confiscate Winnings, cancel placed Bets (even if decided), withhold payment of Winnings, pending the outcome of subsequent investigations.

I have not under any circumstances placed a series of bets with other users or whatever this means. I placed my bets on the biggest leagues in Europe and of course someone else will place on the same game?! The fact that a Casino can just confiscate winnings like this because of their opinion is very shady and this needs to be brought to light of this new bookmaker. I want to request GDPR and proof if this nonsense.