Problem with buying games from Greenman Gaming

Does anyone else have a problem with buying games from Greenman Gaming ?

I have a visa internet card which I used without any problems on other web sites and steam , only greenman gaming wont accept it , instead it gives me this message:

Your Payment Provider has not authorised your purchase. This may be because some banks (incorrectly) believe that Green Man Gaming is a gambling website. Please contact your bank to discuss your order. We are working with these banks to resolve this issue.

I'm from Europe , could that be the problem ? I know GameFly has this issue...

I want my god damn XCOM! QQ

edit: great , just found out they don't accept prepaid visa cards...