I agree- if it's Reg E or Reg Z covered transaction- Unauthorized or Error- but there are many claims that some many call a "Dispute" that are not covered by the regulations. It's those types that it would make sense for the cardholder to try to resolve with the merchant, first. For Visa/MC chargeback rights, we would need the information from the cardholder- but, again, these are "Disputes" not covered by Reg E or Reg Z.