Slow Network - Horrible Support - Non Existent Customer Orientation

I have been very happy with my Telkom Mobile service after a bunch of initial hiccups previously. Decent speed and everything, I could look past the other small things that was irking me. As of last week Wednesday, my speeds fell from my usual 15Mbps to 30kbps. I tried all the basic troubleshooting steps, moving the router around, resetting to factory default etc. Finally giving up as nothing I do improves my service, I contact technical support - the chappy there advise me to do a reset, totally disregarding me telling him that I have done apn change, reset and everything else. Seething, I do it again, to no avail. This morning I try tech support again, just to be told that they are not liaible if I am not using the contract at the premises I registered it with 4 years ago! I have moved 3 times, every time checking that I have coverage for the service when I do, and even upgraded the contract twice already! When I asked to escalate the matter to a manager, my chat session literally just got closed, with no option to save it! Its an outrage that I have to pay R1300 a month, to be treated like an idiot, and told that its not their problem if I do not use the service in a old address of 4 years ago! I told the agent that the tower in my area must be congested or something, as the speeds improve round about midnight. When i bring my router to work, I have a whopping speed of 50mbps, but I use the service at home. Once again telkom fails me so miserably quoting terms and conditions that I will definitely not be renewing my contract with them this time. I want my service restored, or terminated with immediate effect with no financial implications to me, so that I can move to a provider that actually cares about their service delivery standards!