solod86,
You could ask Bill Dozer at the below email for help. He runs a website dedicated to exposing dodgy bookies (and promoting decent ones).
Assistance@SportsbookReview.com
Also, you could try this website that is set up for similar reasons.
http://www.bookmakersreview.com/Complaints/
Hopefullly between those two and Paul they can pressure BWIN into paying up.