Mercari Inc This company mercari I buy and sale many items and the first time I sold and item the rules and regulations is if a buyer purchase a item you print and ship the item so I did I print ship the item to the buyer so day later it's in process ship to town and mercari say it's cancel San Francisco California

so I don't no how can the buyer cancel a day after and it's delivered in town already so I contact mercari to contact they buyer because I want my item or refund and and mercari say they would look into it I just contact again no response they will not respond to me but they buyer has my item so I don't have my item I sold or no reimburse. They suppose to contact they buyer or reimburse me for my item I sold on they site but no respond 

 I sold a item on mercari and the seller cancel my item day after ship postal say it's in transit delivery at address and I contact mercari they will not respond. They rules say they will reimburse the seller or buyer if any problems that it is safe and secure. They will not respond the buyer has my product and they refund.