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I didn't give account details, just want to report his account. Please tell me how to report.

I have reported it.

It would appear there are at least two other accounts involved (those that flagged ME): @sbrukh and @hanen

other accounts involved.JPG

Sorry my account was also hacked and I recovered it now. There are many accounts involved. That person hacked many accounts and used them to upvote and downvote people. Now I am trying to clean all the mess :(