“What is a chargeback?”
Asking the question is probably a good place to start if you want to prevent chargebacks.
A chargeback is a transaction reversal designed to protect consumers. Most refund requests that vendors like you deny will end up in a dispute or chargeback if the customer feels the problem hasn’t been solved. The chargeback process is also initiated when a customer is not willing to work with the vendor to solve a problem and instead goes directly to the card issuer to file a dispute. […]