USA Filing Services Change of Address Scam Internet

I simply went to change my address. I typed in USPS Change of Address and got a site called: US Postal® Address Change - Change of Address Online‎

Seeing how it said US Postal service I thought I was in the right place. It was, after all, the first item in the list on Google (goes to show that google does NOTHING to help prevent fraud). I began filling out the order and when I got to the payment section I thought it was a bit strange. I just figured that the post office needed money since they are having real trouble. Anyways, after entering my credit card info (I had not submitted the order yet), I decided to check. After seeing that it was a fraud I closed the window, but the order went through anyways. I just now noticed the $20 charge on my card for a service I never authorized or received.

I tried contacting the company but they say I need an order number to get a refund. I got no such number because I had cancelled the order...or so I thought. Now I am contacting the bank/dispute department to dispute the charge and I'm cancelling the card so they don't add any more charges. Why does no govt. agency do anything about obvious fraud sites that have many complaints?