Vodacom doesn't wanne cancel contracts (******)

Good Morning, I need your help please. I'm so furious already. My name is Julio Jacobs I took out a 24 month contract at Vodacom (R200p.m). Now 27 months later im still paying and struggling to cancel the contract. They do not assist at shop and say you must phone in but when you phone in you are given a long story and it ends up in them trying to sell you a new contract instead of ending the existing one. To top things off, we lost the sim long ago and did not even use the airtime, which they can see. You pay for airtime but apparently your airtime falls away. I seriously work hard for my money, how long are you guys intending of robbing me? Name: Julio Jacobs Contract sim number: *** My contact number: ***