No assistance from Vodacom’s accounts department

I have been trying get a contact person in Vodacom accounts department to assist me in sorting out my company’s vodacom account for 3 weeks. We cancelled a line in October 2020 and are still been charged for it even after paying the early cancellation fee. As a result our account is in arrears. I have made numerous phone calls to Vodacoms call centre with no assistance. The email addresses I have been given do not work. All I am looking for is assistance in sorting out this vodacom account