Tekom does not deliver - please help me cancel this contract.

We logged an error 13 November 2017 Today is the 29 th December 2017 - Telkom has still not resolved our issue. We are unable to access the internet or use the land line. We have made numerous phone calls which have been "escalated" and marked as urgent. To this day not one technician has phoned us back as was promised by the call centre. I have phoned them about 30 times. We are now trying to cancel our landline but are transferred from 1 person to the next just to get transferred to the "fault logging" line. I hold on just about half an hour each time. I say ENOUGH ALREADY. A cable had to be replaced which seems to have been done but still we have no service. I want to "set myself free" as per their marketing when holding on!! I have spoken to the call centre to cancel this line but the e-mail that I was provided with does not even exist!