Bad service of note

I app**** for Telkom's special for fibre - R499/month last March. It is now September 2021, and they are still charging me R790.00 every month. I have to go into the store and place a call to ask the finance department to please change it. I then had a fault on the fibre line 3 months after installation and 10 months down the line, I have not had a technician come out and see the fault. I was told that, after placing a complaint, there was no signal, so a technician must come out but never seen them. I have a 15-year-old son who does online schooling a few days a week and he cannot hand in his projects. Do not use Telkom. In the last two months, I have not paid the account and when I logged a "call me back" complaint, they said they could not help me until I paid the R1800 that was in arrears. So now I don't have that money and yet they are not prepared to help. This shows that I am being overcharged and I haven't had service for the last 10 months. This is theft, as I have not received what they promised but still take my money every month. Please help.