Yesterday work was hell. I was assigned on a work that was not mine. It was supposed to be the new manager's work. Later, I realize that she also dumped her works on someone else and never credits anyone.

That work was complicated, so I had lesser time to finish my real work and had to do an overtime.

Sadly, there is nothing I can do about it. I've been warned before when I refused to do a work that was not mine.