I also have this problem. Not sure what the website was as it was a while ago, may have been http://www.download-provider.com. Will they charged me the $4 for the trial and the 39.95 straight away, which i complained to the site about, to no avail. i cancelled the damn membership with megadownloadpass.com striaght away and they confirmed it, so i thought that would be end of it.
But this month i found i got billed again, $39.95 under cscashnet.com, i went to thier site http://cscashnet.com/?pg=home and was able to cancel membership with cybererotica.com (hope that helps you Inesdesantiago). I'm hoping this would be the end of it, or odn't know what to do next but cancel credit card, can only wait and see. Damn scammers!