That RFID-enabled credit card data can be easily, cheaply, and undetectably stolen and used for fraudulent transactions. With a Vivotech RFID credit card reader she bought on eBay for $50, Paget wirelessly read a volunteer’s credit card onstage and obtained the card’s number and expiration date, along with the one-time CVV number used by contactless cards to authenticate payments. A second later, she used a $300 card-magnetizing tool to encode that data onto a blank card. And then, with a Square attachment for the iPhone that allows anyone to swipe a card and receive payments, she paid herself $15 of the volunteer’s money with the counterfeit card she’d just created. (She also handed the volunteer a twenty dollar bill, essentially selling the bill on stage for $15 to avoid any charges of illegal fraud.)
So far my CC's have not been compromised. Did once have an issue where a transaction went through twice and turned out to be their IT glitch. Now when I use my CC I use my pin number and cover the keyboard when entering the pin number. I'm a bit worried with the new paypass/paywave feature. I have read that criminals can copy the chip just by being in close proximity to your CC.
Hacker's Demo Shows How Easily Credit Cards Can Be Read Through Clothes And Wallets - Forbes
Hardly ever.
A number of years ago there were a couple of cab charges that looked suspicious as I used my card for some late night cabs. They could not provide any evidence of the charges and Amex refunded my money.
Once....in Malaysia; used Diners card to pay for car rental, shortly after, I found charges at a travel agency in Singapore. Refunded pretty quickly by Diners.