Promised to instal 23 Feb & I'm STILL waiting!

First tried to transfer my Telkom line & that did not work. Made 3 further appointments for installation & got positive feedback in the form of reminders from Telkom that they were coming on Tues 23 Feb. I keep waiting all day & they do NOT keep the appointment! I phone 10210 repeatedly, I email them, I phone head office in Pretoria & nothing I do makes ANY difference what so ever. I don't get given an alternative date or an apology or a reason why they did not come - NOTHING. I quote my order number online & it comes up - this order does not exist. I am elderly, unwell & totally alone, I urgently need a landline. What can I do NOW to try to get some action out of them? Telkom service is shocking, unreliable - DIABOLICAL. I'm at my wits end, this has been going on since Dec 2015. They also tell a pack of lies like \We'll investigate & get back to you,\" We will email you,\" \"The technician will definitely be there by 4pm today & I sit in daily waiting for them. So rude & unprofessional!!!! "