Pathetic VDSL Service.

I app**** for a 20Mb VDSL Line earlier this year and Telkom said no problem, we can help you with a line and so I waited for the installation. I waited for a Technician to come and install the line, after a month and a half I finally got my line, but I was not prepared for the issues that was waiting for me. My Router was just dropped off with a half assed installation with old connection boxes that was rotten, they break apart just by looking at them. I got home and my internet was not working, I phoned the Technician and he said I need to phone in and sort my Account out. I finally got my Router up and running but my connection kept dropping out every 5 minutes and that went on for about another month, and phone call after phone call I couldn't seem to get any help from Telkom until one day I had a conversation to an Openserve agent and they said my line was never ported to VDSL, so they did the port and everything went fine. I had my 18Mb Download and 1Mb Upload, I was happy. Since last week my internet was terrible and so I logged a complaint for it. I'm paying for a 20Mb VDSL Line and I was only getting 12Mb on my line. a Technician came out and he found a few problems, fixed them, he even fixed the rotten box that the previous Technician used but now my Internet is completely broken. On a good day I'm getting around 3Mb/s Download speed, before I thought of writing this complaint I got 0.5Mb/s Download speed. My Router is Syncing at 16Mb/s and I don't even get anything close to that. What Telkom didn't tell me from the beginning was that I am actually too far from the Exchange to get a 20Mb VDSL Line because I am actually 2.8KM from the Exchange. Nobody told me that until recently, so I am stuck paying for a 20Mb line that I cannot use. If I knew that information then I would have made another plan for Internet but yet again Telkom surprises me. I'm not going to pay until this is sorted out, this is clearly a breach of my contract and I will not mind taking this further. Fix my line.