Although there is a lot of hype on stealing data over the web, the reality is that it would be very difficult to steal credit card information from a well managed retail internet site. Reputable merchants will gladly do what is necessary to make you a happy customer. If the merchant does not cooperate, then contact your credit card issuer. The issuer will usually remove the charge. The answer is simple.
Merchants hate chargebacks.
A credit card chargeback occurs when a consumer calls his bank and reverses the charge. Visa and Mastercard have strict rules on how many chargebacks a merchant may have. An AVS means that the merchant will request the billing address of the credit card. For example, your monthly credit card statement may be mailed to 101 Maple Street, Agoura Hills CA, 91301. The merchant may request you to enter your billing address on the purchase form on the web.