Solved Banner users or deleted users problem - Users think their account is being hacked

Isn't it possible to delete all the topics with no USER attached to them?

just delete the topics so there's no more problem?
Uninstalling Jomsocial makes no user is displayed

I did no change.

Is there a way to delete all the posts without any user attached or with a spammer attached?

disable jomsocial. then do recount on the backend - kunena - tools

make sure you selected all options

I did no change.

Is there a way to delete all the posts without any user attached or with a spammer attached?

I disabled anything with POINTS on it it didn't work.

Can I have a query to delete all the messages done by an banned user of by a non existant user?

All my users are going crazy thinking that their accounts are hacked.

How many more months do you want this problem to drag on for and for your forum users to grow increasingly angry with? If you want this issue resolved quickly, quietly and painlessly then perhaps it would be better to engage a database expert to work with you to addess the matter once and for all. It's entirely your choice but, in view of the fact that no-one in this community seems to have an answer, in my opinion it might be better to get another professional's opinion.