Ported out but still being billed for no reason

I have been with Cell C for 5+ years. <br> <br> In the last few years, I have been on month to month post paid account on this line. There was no active contract. <br> <br> Last year, I decided to port out my number to Vodacom, and contacted Cell C. No problem according to Cell C. Rightfully so because I didnt take out a contact with them (on that line) for many years and there was no commitment outstanding.<br> <br> On 1 July 2015 Vodacom successfully ported my number out of cell C. During December 2015 I realise that my bank account was being debited for the past 6 months for the line that doesnt exist with Cell C any longer.<br> <br> During December 2015, to my surprise, I was told by Cell C that I was placed on a 24 month contract by Cell C (let me add - without my approval). They however confirm no device was issued to me.<br> <br> I was given Reference Number: *** on 24 December 2015, and subsequently I have received several calls from Cell C (almost on a monthly basis), where I have repeatedly provided this background.<br> <br> The net result is to date my account is still debited on a monthly basis.<br> <br> VERY VERY FRUSTRATED AND DISSAPOINTED WITH CELL C's SERVICE AFTER BEING A LOYAL CLIENT FOR 6+ YEARS.