cancellation of contract

In Dec2015 i got a text that my contract expires in Jan2015... so i called in Dec to let them know i want to cancel the contract.. they said it will be in Jan. In Dec n Jan 2016 i couldnt pay my debit order but i kept enquiring with cell c and they said they cant cancel it since my acc was in arrears. After i paid i called and the consultant told me i cant cancel a contract because if i cancel it the the number has to be deactivated as well. And another one said to keep my number i should allow Cell C to deduct R69 1gig every month but i told her i dont want ANY FORM OF CONTRACT with cell c. YESTERDAY I CALLED AND SBONGILE TOLD ME THE SAME STORY.. my contract that i signed was until January2016.. now they have guven me 1gig which i did not consent to.. and again the lady told me i have to guve them a 30 days notice for them to cancel my contract.. so meaning i am currntly paying for what I HAVE NO IDEA ABOUT.. AND I DIDNT AGREE TO ANYTHING...