Tricked & mis sold 'Keep away'

I received a phone call out of the blue from their very clever and devious sales person who told me that the professional body I belong to has given them my number and that they were supporters of their company. I was a new company starting up and needed any work I could get therefore I was talked into taking their cheapest package, and was told that I would get my money back if I didn't get any referrals after 12 months.
A day or so after being sold the advertising I received an email from my professional body stating that 'The Big Green Book' have been contacting their members and they are not supported by them.
I have sent numerous email to them requesting a refund as I did not get any referrals, but as to date have had no contact from them. I feel that I will have to put this down to experience as I feel that it will be a waste of time pursuing it further. I will not fall for the same sales pitch again.