I'm not answering my mother's phone calls
Did something happen between you and your mother?
She was the one who messed everything up for me, she has no right to interfere in my affairs.
If you mom really messed things up for you that badly then it's fine to distance yourself from her. That being said if it really isn't that big of a deal you could be being extremely hurtful. Think about what she really did and decide from there.
Whatever, I'm doing this to hurt her even though she doesn't deserve it.
If you know she doesn't deserve it, don't you think you should just answer her call? You might regret the missed time you had with your mom later.