I tried to purchase Maclaren Twin stroller on Mercari from user "wally27". I negotiated the price and the seller confirmed the purchase. The seller shipped my order but canceled it within one day because "barcode does not scan". The seller also blocked my account so I cannot buy or message him. But the stroller was still available for purchase. So I used my husband account to try to buy it, this time for full price. The seller canceled the second order within few minutes and blocked my other account too. I am already talking to Mercari to cancel the "wally27" account and any other accounts associated with this person*home address.
We apologize for this experience and can imagine your frustration - as every item on the app should be on-hand and available at the time a listing is created. Because Mercari is unable to guarantee a seller will ship a purchased item, we allow them to cancel transactions if they have troubles sending it off (so buyers can be reimbursed as quickly as possible). Sometimes this also means that sellers aren't completely honest in their reasons, but we do watch and penalize accounts should they have a large number of unwarranted cancellations. We appreciate your feedback, and look forward to hearing from you via the in-app Help Center or email support address.
Best Regards,
Team Mercari