Worst experience ever

I've signed up for fibre from one of Vodacom agents that come door to door.They said I will pay 320 per month the January they debited 600rands o called voda fibre customer care n told them about the situation that their agent sold me false advertising he said the wifi is 320 Nd it comes with the TV box,the sales lady told me that their nothing they can do cause I don't have proof.I was like how was I gonna sign up for a wifi if I didn't have a smart TV the reason I took it is cause of the free TV box.Now I'm owing Vodacom 2400 for something that I don't use..really I don't know wat to do anymore..plz assist.tanx