My experience and I only wish I came across this site to warn me of Mercari and their horrible business practices. Mercari acts on an all sales are final after you give a review of your item. So I never gave a review and I refuse too. I warned them ahead of time that if they didn't want to refund me even though it clearly states defective items are refundable. So let me get to my experience so you can hopefully avoid something similar.
I was looking for a replace laptop after mine died. I came across Mercari after a TV ad. So I used it to get an apple g4 laptop. I waited the shipping time of five days and when it got here I used it for ten minutes and it died. I had to tell the customer service for almost a month the product was defective and the refused to give me a refund even though their own policy states they could give me back my money. The seller I got the item from refused to take the item back but Mercari would take it back. Nope. I'm going to fix it on my own and sell it locally. Get my money back. Don't do business with these people. I lost 75.50 and my item was defective and refundable and refused. So just save yourself the trouble and spread the word to put these people out of business forever!