Telkom openserve

I moved into a home and found an openserve router for fibre to the home, I asked community about the network and everything got everything and app**** for my own fibre. They only activated the line again no passwords were changed nothing so now I am having a problem with the entire community being connected on the fibre by the previous users I called Telkom several times to have the password changed they refusing telling me they can't so as a customer should they not offer me a new box or installation as I found this connection here and I was not aware that the entire community was connected to this fibre I just need help with this really it's not fair that I pay so much for everyone else to use and when so many people are connected to the line the connection becomes slow I don't enjoy my fibre line with them at all