@tsarstepan,
A method that some people have tried is to start a Part 2 thread. Not sure if that also manages to lock the original thread from getting more posts (although I think it would be wise).
Seen this issue a few times, sometimes it's so danged frustrating that my blood near to boils!
Contact the contact button, maybe that can do something. On another board years ago, they would 'trim'
anthrax a thread in this sort of scenario. Maybe similar could happen here....