Mastercard Reason Code 4853

Mastercard's broad 'the product or service wasn't what I expected' dispute — covers not-as-described, defective, or unfulfilled claims.

A quality, condition, or fulfillment gap between what was promised and what the customer received.

The listing, order, and any support correspondence are your core evidence — this is Mastercard's most common consumer-dispute code.

Product listing as it appeared at purchase, delivery/fulfillment proof, and support correspondence about the complaint.

Not archiving dated product listings, so you can't prove what the customer actually saw.