Big Option (Binary Trading Company) Wouldn't let me withdraw money Internet

They were very persistent and pursuasive  in getting me to deposit £5000 from my credit card.  They then said that I could do a no risk trade of all that money on something that was almost a certainty but not to wory if it didn't work out because they would give me bonus of £5000 if it didn't.  I then went on to make £800 using this money but when I tried to withdraw the £800 they told me that I didn't make the trading criteria and that  I would have to 60 times for every pound that was given to me as a bonus.  This therefore means that I have to trade £300,000 before I am able to withdraw any money.  Needless to say that I have written this money off in my head because there is no way that I will ever meet this criteria.  This company is a scam so please everybody that reads this don't get duped by them and be very careful that you know the terms before doing any business with a binary option company