Duplicate purchase

Hello,
On December 26, I purchased a piece of armor from the official website's appearance shop. However, during the purchase, the transaction failed, and I clicked again, which resulted in buying two pieces instead of one. I would like to request a refund for one of them. Thank you!
my id is 主哭副躺
I've sent emails many times, even had forum posts deleted. I hope there's a way to get a refun