I would tell him to look at the details of the order in his order history where he will see that it has been refunded, and reiterate that refunds can take a few days to show up. I wouldn’t respond again after that. If he opens an A to z claim, it will be closed in your favor if you’ve already refunded him.

If you had used Amazon Buy Shipping, then no worries. This would also have been protection from refunding since the package is misplaced by carrier.
Are you recalling the package? Or is the buyer getting the refund and the package?

Why do anything else? The customer was unhappy, did not think he got his refund, and you answered him. Good job. It was just a customer request – although maybe not worded very tactfully.

He “threatened” an A-Z if he did not get the refund, he didn’t threaten to shoot you. I cannot understand the outrage people seem to have when customers tell them if they don’t get satisfaction they will complain to Amazon. You don’t know that already?

I have customers that repeatedly email me threats after they have been refunded.
I copy and paste the message that I sent to them previously that they have been refund.
If they email me again I mark it as no response needed.
They either aren’t getting the messages or they are just nuts.
I refrain from posting which one of those I think it is!

Nothing

What? Did you buy the label through Amazon? Never refund for the carrier issues. The best thing is A-z and Amazon will reimburse for INR claims… If you’re denied just appeal and explain the policy, and it’ll be approved.

Did you email him to tell him that?

There are a lot of sleazy sellers on Amazon, so some customers are scared of getting screwed again by one of those sellers.
If you don’t work hard to differentiate yourself from the sleazeballs, the customer may assume that you are one of them.

Imagine that you own a brick&mortar store. Pretend that the customer is face to face with you.
If you refunded him, would you just quietly slide the card through the card reader with no comment to him?

Same exact thing happened to me today. They don’t care. They just want what they want when they want it. My person left a negative feedback calling me a thief and Amazon won’t remove it even after they told the public to buy it at another store cheaper.