What are the rules for signing, modifying and canceling the contract at the instant messaging counter of Minsheng Bank?

Provisions on signing, amending and canceling contracts at the counter of Minsheng Bank: I need to go to any business outlet of our bank with my card and valid ID card. If a customer signs multiple mobile phone numbers, it is not supported to cancel the contract one by one at the counter, only one-time cancellation is supported. After logout, each mobile phone number will receive a logout message.

(1) China citizens who have reached the age of 16 but are under the age of 18, and who do not take their own labor income as their main source of livelihood, and China citizens who live in China and are under the age of 16, cannot handle it by themselves. The guardian can help him, and the minors don't need to be present at the same time. Handle this business with the guardian's ID card, minor's resident ID card or household registration book and guardianship certificate.

(2) Those who have reached the age of 16 but less than 18 and whose main source of livelihood is their own labor income have reached the age of 18; I need to handle it myself, and I'm not allowed to do it for me.