Ended contract that I

Hi there, I had a contract phone with you guys which was supposed to end last year in July 2015 (according to my knowledge). It has been brought to my attention that I owe a total of R990 for not cancelling my contract by going into one of your branches. The lady I spoke to from the attorneys says it is a penalty fee for not cancelling the contract. Which I feel is unfair and outrageous. If we all aware that I have a 24 month contract and I dont renew it then surely the contract should end at no cost to myself or yourselves. So why do I have to be penalised for not cancelling the contract and had no idea that I had to cancel the contract in writing or by going to a branch??? In this poor economy and as a single parent R990 is a steep amount why didnt anybody bother to call me to ask me my intensions of this contract without deciding upon yourselves to hand me over to attorneys, is that treating your client's fairly or malice conduct?? I DO NOT want to pay this amount nor can I afford it plus attorneys costs!! Take this as my cancellation notice!! Hope somebody can get back to me so we can resolve this amicably.