Today 10088 called me and said he was an account manager. Is he a liar?

Haha, this is the customer service number of the mobile company. It says it is your account manager because the mobile company will classify and manage customers, and then assign the classified customers to the customer service of the mobile company according to the number. When a customer service personnel provides services (mainly maintaining customer relationships, such as sending holiday text messages, event text messages, etc.), this customer service staff is called an "account manager."

If you have any questions, you can contact your account manager, who will provide relatively fixed services.