Don't do it as this is often a popular boiler room scam to obtain the initial payment and little else
How did you get your infr,ation to call you normally gets an interesting response
Only ever consider a TOTALLY no win no fee action, even perhaps say that they can have 15% and see how they react, chances are they will go away
Might not be the same company but plenty of warnings already on the web
http://www.fca.org.uk/news/warnings/fast-line-legal-services
http://forums.moneysavingexpert.com/showthread.php?s=b82ae71899b32dbd099fd4737508bfb7&t=4426877&page=2#topofpage