Stop Telemarketers by Complaining
Oddly, this is also the way you can get a refund if you've been scammed.
Just a short post today, though you can expect more in the near future as this personal campaign ramps up.
http://www.elsop.com/wrc/complain.htm - is a long list of internet links on where you can complain.
http://www.fraudbureau.com/midlink/enforcement.html - is a longer list of police and legal authorities you can complain to about a specific firm.
And you can always tell the credit card you've been frauded and request a charge-back - but I'll tell you more about this as I research it (and apply it to my own scene.)