You can invoke this protection on your credit cards, when a merchant charges you for products you ordered but that never reached you, or when your credit card bill is overcharged. A federal statute, Fair Credit Billing Act (FCBA), protects you when you use your credit cards. FCBA provides that you may dispute any charges that are made to your credit cards and, that while the credit card issuer is still conducting investigations, you have the right to withhold payment without being subjected to interest for the corresponding unpaid amount. Because of this law, credit card companies are forced to pay attention to your credit card dispute. The merchant involved may, as a result of the dispute, incur credit card chargebacks.
There are things you need to do if you want to avail yourself of these consumer protections afforded to you on your credit cards by the law:

· File a written statement to the credit card issuer at the address indicated for “billing inquiries” - not the address to which you send mailed payments. This statement must contain your name, address, credit card account number (not the card number), and all particulars and descriptions regarding the erroneous billing transaction including the corresponding amount and the date of the erroneous transaction.

· Send this letter to the credit card company so that they receive it within 60 days from the date of the first statement that contained the erroneous transaction entry. Suppose you did not get the billing statement? For instance, an identity thief may have changed your account address. In such cases, the credit card dispute letter should still reach the card issuer within the required 60 days. You should have an idea (or ask) of when the credit card companies usually mail out the billing statements. Make sure you receive your statements every month. If you don’t, follow up without delay.