If you can prove that you were misadvised or missold the product then you may well have grounds for complaint/compensation. Having promises such as you mention above in writing would certainly strengthen your case. Trying to prove that something was said verbally will obviously be a lot more difficult. Do you have any written documentation which might help with such a complaint/claim? Have you contacted the company in question about this issue first and then, if you don't get a satisfactory response, [broken link removed]?