Impossible to cancel contract

Approx 4 years ago, I bought a ****le from Vodacom, along with a 2 year contract of R99 for 1gig of data per month. This worked very well for me and when I was told that the contract had expired, I asked their agent to please continue with the R99 as it was very useful. <br> However, I now find my normal cellphone does the work better than a ****le and so I wanted to cancel this R99 ****le. The agents now tell me that I've signed another 2 year \Upgrade"contract even though there is no 'hardware\"" to upgrade. And if I want to stop this"