Hi there,
Very sorry to hear about this. I think you should get in touch with Clive Hurst, who has a leading role in the actors' union (Equity) and is a well-known campaigner against upfront fees and portfolio rogues. He has his telephone number and e-mail address on his website, and has been known to get people's money back in some instances. Worth a go, and fingers crossed it turns out okay. I'd also suggest you get in touch with your nearest citizen's advice bureau.
Clive's website is www.anactor.net
In addition, try reporting this to the BBC, through Watchdog and Radio 1- they take in interest in these things and I feel that if victims at least make their experiences known, then something can be done. The Daily Mirror (Penman and Sommerlad Investigate) would equally be interested I'm sure. But in the first instance, get in touch with Clive and see what he says!
Best of luck!