Within three minutes. The official website of the Postal Savings Bank of China shows that after losing your Postal Savings Credit Card, you should immediately contact the credit card customer service center to report the loss. After reporting the loss, you can lock it within three minutes and stop any use of the credit card to ensure the safety of your funds. Postal Savings Credit Card is a RMB credit card and is a UnionPay standard card. It has all the functions and services of a UnionPay standard credit card and can be used freely for consumption at home and abroad. The card is valid for three years and can have four additional cards. .