Can I complain if the postal savings credit card is deducted as soon as it is repaid?

Of course. Postal savings credit card is a credit card issued by China Postal Savings Bank. According to the announcement issued by China Postal Savings Bank, as of June 20, 2023, it is illegal for the credit card of Postal Savings Bank to reduce the amount as soon as it is repaid, so it is impossible to make a complaint.