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Usually the credit card companies have a good process to protect the card holders. If you inform the credit card company in writing that you did not make this purchase or authorized anybody to make this purchase, the credit card company must request the merchant (the store that charged you) to show proof of your purchase, i.e, your signature on the sale slip. Usually this only takes about 45 days.
If by the end of this period the merchant failed to show the proof, then the credit card company will credit your account for that amount and any interest associated.