False advertising, unfair contract

I signed up for a 24 month contract in 2013 and June 2015 was supposed to be the final month of my contract. Apparently not, the contract does not end within 24 months, I have to end it and that is in the T&C's which I never got from Cell C. The only thing I got from the store was a Tax Invoice explaining how much I was going to pay and for how long, my banking details, personal details and my employer details only, Nothing about I must cancel the contract in month 24 because the contract will go on. Cell C, please stop misleading your customers. I need proof that I signed for those terms and conditions. When you advertise a contract and you say 24 months but actually is forever and you fail to inform your customers, that's unfair practise.