Exploitation from fonechoice

A guy called me to convince me to take notebook because i have an account with homechoice and im paying well. I agreed but we talked about 24 month contract because already i was paying for my plasma that i took from fonechoice and it was for 12 month. Since i never received a statement until when i thought im done paying all of a sudden the send a statement.i respended to that email saying im done paying them abd im suprised. I eved went ahead to call them to adress the matter but instead they keep on harrasing me. I reversed this month debit order i even stopped it. I told the to look for a phone record i need that phone record. They want me to pay for 36 months hence i took a contract of 24 months. Kindly help me. My name is Nomsa sephula ID ***