Worst Service and over charging

Wow where do I start. SO 4 Months ago I app**** for Fibre with Telkom being my ISP and doing it through Vumatel. So they come to install it and everything is running fine (internet STILL slow, no speed increased, same as the old ADSL we had) Then every month the bill comes and its over R1000. Whereas the package i selected was R806.10. I have been in contact with Telkom on Facebook messenger because everytime i call the PATHETIC customer service department nothing gets resolved I keep getting people appologising to me and saying it will be escalated and YET nothing happens. This has been going on for 4 months, and I just want my bill to be fixed and YET no one even has the decency to get back to me and fix their error. I am so frustrated and feels like im talking to a brick wall. Telkom should just close their doors cause what is a service company that has never supp**** good service EVER and all I see is people complaining about their ****py service.