I agree with Omega, please contact the bank rapidly and stop payment, this site has never sold winmx and a quick look around will show you that its a free support site run by volunteers, as such we help all users to enjoy the FREE and pleasurable winmx experience and community.
The internet is unfortunately awash with these fraudsters who sell free products, I hope your not put off of winmx by their actions.
Please let us know how you get on with the bank and if you need help on a technical matter just post again.