Telkom shocking service

I've requested telkom to cancel my Intenet service on my fixed line about 2 months ago. They said after they receive the request, it will take 30 days to cancel it . It's been more then 60 days, and I'm still getting billed. I've phoned the call centre numerous times, and all they say is they will escalate it and I'm still sitting with the bill. I dont know what to do ? The service is shocking. The last lady I dealt with said now i have to check in with them after 10 days to see if its cancelled. I'm pretty sure it still wont be. And will continue to be billed.