@noted their paper was damn a mediocre. Very weak, I discard the whole part they worked on . Firstly, they couldn't do what i told them to do. I just didn't want to waste my money and afterwards i told them to draft the methodology. Unfortunately, It was bad. And ofcourse I'm not fearful I insulted them badly and block them. Certainly, their threats can't move me an inch. Even if they report me i would be glad to defend myself. I'm not literally weak in research. Infact i published my papers. And sometimes i do project for students. I was quite overwhelmed, that was why i decided to ask them work on a part of it.
