Amazon's returns policy allows most items to be returned for a refund or replacement within 30 days of the estimated delivery date.
However, some products are non-returnable, including perishables, products that may pose potential health and safety risks once sold, products with shipping restrictions, and customized products. You can see more examples on this buyer-facing help page: Items that You Can't Return
The product's listing page will let buyers know before purchasing if it is not eligible for return. Such non-returnable items may still qualify for refunds or replacements if they are delivered to the buyer damaged or defective.
Seller Help: Seller-fulfilled returns, refunds, cancellations, and claims
For non-returnable items, do the following:
Please Note: Buyers cannot initiate return requests for non-returnable items through the online returns center. On the Buyer-Facing Help Page: Amazon Return Policy, buyers are instructed: "In the unlikely event that a non-returnable item arrives damaged, defective, or materially different from what was ordered, please contact Customer Service."
How do we get Amazon customer support / seller support to follow Amazon's return Policy?
I have a customer that keeps harassing Amazon and Amazon keeps harassing us for an item they bought in November 2022, 2.5 years ago that they are currently trying to return. And it was a Hazmat/Dangerous goods product, which is considered non returnable by Amazon, yet Amazon seller support keeps asking us to pay to take it back, 2.5 years after the customer bought the item.