Someone used my QQ to say in the space that it was useless to change the password. What should I do?

What a coincidence! I had the same problem a few days ago. It is estimated that some websites authorized by you have stolen your number. Go to qq to surf the Internet first, clean up all the authorizations, then modify the password and delete all the unsafe software in the computer or mobile phone. Finally, see if there is a time setting in the space (this is my reason, some websites use the space to send qq messages to Aite people regularly), and if there is, delete it.