Hello Yuan,I have some great news for you! The adjustment request I have submitted for you has been approved and processed by our specialized team. You should already be able to see this reflect on your Transaction History within 24 hours. I am happy to be of assistance to you on this issue.Since I was able to provide the help you needed, I will now mark this case closed. Please feel free to open a new support ticket if you have future billing related concerns.Sincerely,NelsonGoogle Cloud Platform Billing Support