Merchant provided illegible sales data upon request.
This is a processing-error code: something in how the transaction was submitted (amount, currency, timing, duplication) is contested. The dispute is decided on your transaction and settlement records.
Show the correct processing record: settlement reports, batch timestamps, and corrected transaction data. Where the error was fixed (e.g. a duplicate was refunded), document the fix with dates and amounts rather than arguing the original error away.
You typically have 120 days from the dispute date to submit your evidence package through your payment processor. Missing the window forfeits the dispute regardless of merit, so assemble the checklist below as soon as the dispute arrives.
This code maps to Discover CRCG IC. Confirm the current wording, timing, and document requirements with your processor before submitting - networks revise their guides and your processor may impose shorter internal deadlines.