Why did China Construction Bank deduct more money from me?

According to his description, it was definitely not a credit card. The credit card statement was mailed and more than 500 text messages were sent to notify him. How could he not know how the money was deducted?

If you want to know how the money is deducted, why not go to the bank and print out the transaction details? Print the details to know how your money comes in and out. This is more convincing than if you

swear others and believe them!

As for the statement that more than 100 yuan will be deducted for changing your mobile phone number, I suggest you check your own accounting situation. You said you applied for SMS notifications,

then there should be notifications for every financial transaction you make. How could you not know? Unless you sign up with someone else's mobile phone number, it is possible to transfer your money through online banking or SMS transfer.