China Construction Bank deducted the SMS fee twice.

This is normal. If you register for SMS banking, the monthly fee is 3 yuan. You register two cards. The first one is a debit account. No matter how many accounts you register in the future, the fee will be deducted from your first signing card. Because the first signing card is the debit main account, it will only be debited from your main account, and will not be debited from other accounts. If you want to change the deduction account, you need to go to the bank. You need to bring your ID card and related savings card.