Finally, it catched me, too. :)
Yesterday while I was checking my online bank account I found out that there were some transactions from Microsoft Adcenter, which weren't mine!
Oh, god! Microsoft?
I've immediately called Microsoft Adcenter's Support and they admitted they fault.
"What the fuck?" will say one of my colleague. Is Microsoft credit card verification system so bad?
Or they don't have such at all. :) I guess it's the second reason.
At least how can someone use my credit card and they hadn't check him by phone before making a charge to the credit card.
Bad, bad for them.
Hope Google's Anti-Fraud System is better. I'm using Adwords. :)