I'm not going to answer my coworker's call a even though I was on duty
Why won't you answer their call?
I really don't trust them.
It's part of your job to answer calls in an emergency. If you don't answer the call, it could appear that you are uncaring. It's best to your job or you could get fired.
Nah, I will just stop answering the call.
But I really think if you keep avoiding calls you'll be fired eventually. Why not just answer every once in a while?