I received a text message from ABC saying that the money was transferred from 300 yuan and someone took it away. What should I do?

You can't describe clearly whether you took 300 cash or transferred 300.

On the premise of determining the authenticity of information, there are two possibilities for appeal:

First, your card has been cloned, which is the most dangerous situation. Now criminals can empty your money at any time.

Second, the online banking, Alipay and other self-service transactions you handled had problems and were cracked by phishing software.

Third, pay electricity, telephone and other expenses. As long as you know the card number and password, you can trade. It is not excluded that people around you know your card number and password.

If it is the first or second case, you should call the customer service of ABC to report the loss temporarily now, and go to the bank to report the loss officially tomorrow. If you can't confirm the reason, I suggest you temporarily cancel the self-service business such as online banking and Alipay. In the third case, just change the password.