Telkom is really HELLKOM

I have transferred my line 10M ADSL almost a year ago. I can only receive 4M where I stay but I'm still being billed for 10M. I have numerous escalation refs and it has been closed without anybody getting back to me or with me being credited for paying extra. The problem is that I have to keep paying otherwise my line will be disconnected. Really ****TY service and a waste of my money.