All winnings confiscated when attempting withdrawal

I have used dream bet welcome offer for Ireland. Deposited 150e and got a matching 150e bonus. Rolled over bonus mostly on horses with few football matches in on variety of odds in general not lower than 2 and not higher than 15.
I completed the identity verification. After some time I was informed by casino I have completed my bonus rollover and my winnings were converted to cash. My remaining bets placed with bonus funds were automatically cancelled by the casino. I have attempted to withdraw my winnings (this casino offers only one free withdrawal a month) and I signed up for the next bonus offer to use with next deposit. After 5 days my withdrawal was still not processed so I started doing some reaserch and thought maybe I still need to roll over some cash since they require 5 times deposit rollover due to money laundering policy. Since I wasn't playing bonus funds any more but cash I decided to use the enchanted odds on Football since there was some good football on.
After few days I attempted another withdrawal and all my winnings were cancelled due to supposed breach of terms and conditions.
I went through the terms and conditions again and there is nothing there saying I can't change strategy AFTER finishing my roll over. I may have placed higher than allowed Bets but in this case casino reserves the right to count bets up to 50% of the original bonus to the rollover. With they confirmed I have completed when they cancelled my Bets and congratulated me finishing wagering.
I feel they unrightfully took my winnings.