Never can keep to promised times - unacceptable

I have been sitting without access to internet via my wifi router since 21 January 2015. I have followed procedures and with Telkom finally coming out to my house to test the line, there was no fault with the line. Rather it was the router that is causing the problem because they tried their router and it connects to the internet. I have had 6 calls with an Mweb technician from 21 Jan -30 Jan to test the wifi router (reset, log onto router to connect...) and the same errors emerged. Finally another technician called me on Friday, 30 Jan while I was at work to troubleshoot the router (what ever that means), and I asked him to call be between 4pm and 5pm that day. He called at 7pm while I was out with friends. We arranged for him to call at 5pm on Monday 2 Feb. He did not call. I have had this router for 1 month and it is giving problems. If you do not sort out this situation ASAP (meaning I'm giving you until Wednesday to make sure I am up and running), you will refund me pro-rata and I will not be renewing when my 6 months period comes to an end. In fact, the service is so bad that I am in my rights to terminate my contract according to CPA (but I will give you one more chance)