Yes, it is possible to sue them in Curacao.
Their terms of service are basically valid, because they state the operator and have a license. But paragraphs which are not in accordance with the Curacao civil code are not valid. And Curacao civil code says that they have to deliver proof of their claim, so the confiscation without proof is not valid!
Thanks. I filed a complaint to their licence regulator and waiting for the response. Then I am considering a possibility to report fraud activities to the UK Royal Police as far as these bookmakers recieve payments through enterprices registered in England and BVI.