Cell C contract is a big **** i regret having a contract with them and i dont advise anyone to take a contract with them

I had a contract with Cell C, 24 months contract which i paid up on February... Nobody told me that ill need to call them and ask for my account or contract to be closed when i took this contract, i was only told about the term of the contract and the subscription of R180 p/m.. Im really sadly surprised that they were very quick at calling when ive missed the payment of subscription, but couldn't careless to explain that ill have to call for cancelation until i saw that i owe the 2 times more after making the last payment.. So now Cell C is continuing to bill the account. At the end of February it was said i owe R480 which i dont even know what is it for but i paid it because i wanted to close the account after i called for cancelation i received another statement to say i owe them R360 again, what for because we never agreed on month to month subscription and top of it all i cancelled the account, what is it for kahle kahle?? why are you milking money from me that i dont have?? You are really ****ming me... I wish i never took this contract u r making Financials really difficult.. You are a big **** and very inconsiderate.