Telkom line incompetence of billing staff

I have a telkom line for +/- 3 years which i use to access adsl. The line is only active for Netflix and surfing. I have been billed for the line usage. According to my investigation, i am sharing a line with another resident and i am billed for all the calls that they make. I only took this option as i didnt want a telephone line. I have tried to rectify this problem via email and telephone calls but to no avail. I hv checked my December 2022 and the same issue persists. Why us the service so poor.