Dishonest Service - Very Angry Upset Client

I took out a cell fibre contract end of February this year, the sales agent mislead me and made me to believe that it is one month free and my first deduction will be end of April. To my surprise there was a deduction and upfront fees debited from my account which she did not tell me about. I contacted Cell C on 2 March to advise them and to cancel the contract as there was a 30 day period to cancel. Since then it's been numerous emails and phone calls which lead to absolutely nothing from their side. I am now listed on ITC for something that was not my fault. I was mislead and she was dishonest to me. I cancelled within the time period and yet they continued to deduct from my account to the point where my cheque account was handed over to the collections department. Despite the fact that I contacted them several times regarding the cancellation they continued to put through the debit order. Do not deal with Cell C they are a ********** telecommunications company who do not listen to their customers and are not customer centric. They only want your money, and don't care about treating customers fairly. Take fibre out someone else. I am very very very UPSET, I am now owing the bank and I am listed on ITC.. i CONTACTED THEM AGAIN today and was told that I cannot get a paid up letter as there is still an amount owing. I DO NOT NEED A PAID UP LETTER AS I CANCELLED THIS CONTRACT WITHIN THE 30 DAY PERIOD. I NEED A LETTER STATING THAT I cancelled this contract due to being mislead and an apology and need this removed from ITC.