Vodacoms customer services are horrible

Absolutely unnaceptable. Such bad service. I app**** for fibre through Afrihost, but when Vumatel activated the line, they activated the line of the lady that stayed in my place before me whobhad fibre with Vodacon. Now they are refusing to cancel the line before she pays the bill, but she never gave concent for it to be activated. Every time i call no one and i litterally no one helps, me such bad client services and it wasnt even me who made the mistake. I need internet for my work. And this struggle is prepostous. When i said i wanted to speak to a manager they always say they are no in.

Please tell me what to do!!!!!