Telkom landline down for 3 weeks

My Telkom landline has had no dialling tone for three weeks. I reported the problem on 8 January. I escalated the problem on 25 January, at which point they promised the problem would be resolved within 48 hours. My problem persists, and I have had no indication that they intend to resolve it. They have, of course, had no hesitation billing me for a service I have not received.