Bad Customer Support Experience.

I cancelled my Vodacom contract last month and this month I received a message that my account is in arrears. I contacted the support desk to understand what is happening but agents is not able to assist me. I was referred to a collections department, but when I enter my number for verification Voice prompt is not able to validate the number. I called Vodacom Business and when I enter my number I am being given invalid options to choose from when all I want is to speak to a human to explain my query and get assistance. I am going from pillar to post with no direct path as to who or where I must get assistance, and now I am greatly frustrated. Can someone take ownership and assist with my query until closure, please!!!