The option that is not a duty of the customer from the passage read is
This is an obligation that is owed by a customer to the seller or the producer of a good or service.
This definition is based on the question we have. The option that is not a duty of the customer is to return the item after the 13th day. This option is not listed on the agreement.
Read more on a duty here: https://brainly.com/question/25242169