You will have to contact your bank or card issuer. Some banks require you to go to a branch, but many will have online forms to fill out. With card issuers like Cap one, Chase ,Amex etc, you call the customer service # on the card and they will start the process. The situation can be different depending on the issuer and whether you were using a credit or debit card.
You would contact the seller if you have an issue with the transaction and you are seeking a refund, a chargeback is used when the seller will not refund the transaction.
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