Pathetic Cell C

I Have canceled my Cell C Network for the past 3+ years, Cell C has then started sending me statements that my accounts were in arrears , I still remember clearly that the consultant suggested I pay for what I use so, therefore, it remains as an open contract I was under the impression that if I didn't use the number I won't be charged but nothing was told !!! Cell C Consultants has been calling me numerously for payments which are ridiculous, I have not been using the number for 3+ years why didn't they ask me then only after 3 years? now cell C is going to affect my credit score because I refuse to pay for something I have not been using for 3 years now. till today, no updates nothing whatsoever my cell c account number is: ***