I'm going to cut off contact with my sisters
What happened? why do you want to cut out your sister?
I don't like them much.
Cutting off contact with people you don't like is normal, but they are your relatives. Sisters might seems like they are not likeable at times, but the real reason might lie within you. Do some self analyses first and then decide on your next moves in order not to cut ties too quickly.
I need to loose all my ties with them and let them see how much I don't care.
It is wrong to cut all ties as a punishment. You should tell them how you feel they might be understanding and want to apologize to you.