When a merchant contests a chargeback by submitting evidence in an attempt to reverse it this is known as representment. By “re-presenting” the transaction with a rebuttal letter explaining their position and any supporting documents, the merchant hopes to convince the issuing bank that the transaction was in fact genuine.

Read the rest of this fantastic article over at The Merchant Fraud Journal. 
https://www.merchantfraudjournal.com/understanding-chargeback-representment