IronFX brokers won;t release my funds

Hi, I turned 500£ GBP into £2200 over the past year. IronFX won;t let me withdraw, won;t answer emails or return my calls.
Why is it when I ask to withdraw they can do this and tell me to go hang basically?
Has anyone else had such problems with IRONFX? Any ideas what I can do to get my money out?
Thanks for your help in advance
Freddie