Cell C payment

On the 07th of January, I received a message from Cell C advising me that my line will be suspended due to non-payment. I have made an arrangement with the company to debit my account on the 20th of each month to my surprise now only I'm receiving a message that payments are not done. I have been a loyal customer for over 4years and I have never missed a payment. This line that they are threatening to close is for business which I cannot afford to just to be closed. Why was I not advise on the same day that no funds were not received, why wait for so long to notify the customer, if funds were not received why all the data, SMS, and airtime were loaded. I have been contacting the company numerous times and promised that a supervisor will contact me. I have spoken to Modise Mokoma, Monewa, Anele, and the supervisor who was supposed to call me is Tshepo until now I'm waiting. With this treatment I got, I'm not willing to renew my contract at all. Every month I'm paying R581 which I think one of the network companies would appreciate me as their customer.