Deeply Disgust

In December I switched my adsl service provider over to Telkom. I app**** for a 10mb Uncapped line and they said there were no 10mb line speeds available in my area. So i signed a contract on a 4mb uncapped package and received a modem with. 2 Days ago I noticed im getting slower speeds and it was very noticeable. So i did a speedtest and i got 1.70 mb/s, i thought it was only a problem with the speed that day but when i got home the next day and I saw I was still getting 2mb speeds I phoned telkom. After holding for 20 minutes my call was answered by male consultant. I gave my identification stuff and explained my problem. I was told to hold on for a few seconds.He then kept on saying i was on a 2mb uncapped and that i was paying for it. But for the following 3 months i was paying +-R800 per month for a 4 mb and i was getting 4mb speeds..Although not anymore. He then refused to change anything.He then put me through to another section. After holding another 30 minutes i was told exactly the same. I was on a 2 mb and that i was paying for it although i know i was not. They are refusing to change it back. I PAY FOR SERVICE I EXPECT TO GET WHAT I PAY FOR AS THINGS ARE NOT FOR FREE