Author House — book publishing

I signed a contract with authorhouse under the cheapest package they had, they took out the first month's initial payment, they had me send a manuscript. They had me send an author bio, a book bio, and an author's picture. I no longer want their services, how do I get them from not selling my books. I feel i've been frauded. When I call the intake check-in lady her name is rowella alvaro she does not call me back for weeks. I do not want them to still my copyrights by using an isbn number, my name is adrian w loomis iii please call me at [protected] I can explain more it is a long story. Thank you.