Same issue every month

We had our adsl line installed 3 months ago. Every month from day one we have had endless issues with the service provided. Every month its the same messed up story, come close to end of month and out internet goes down like clockwork. We pay on time every month and yet we get shut off. I phone in get told they will have to reset our password. Once that is done then internet runs fine till the 20th every month. We even got governed on our second month of using the internet and when I phoned in to ask why then I get told you have reached your cap, when I question what is my cap cause I have uncapped, then I get told I dont have a cap, then I ask then why is my line running below 1mb a second I get told I reached my cap and then I ask what is my cap and again get told I dont have a cap cause I have a uncapped line. Then a few days later I phone back in cause it was still below 1mb a second. The other operator then tells me I have been governed, I ask how is that possible because I have a 4mbps line and that gives me the right to use x amount of gigs before they implament fair usage policy aka fup, and I had not even used a quarter of that x amount and he even confirmed that I was unfairly placed on fup. This month so far from the 20th of september till today 2nd october I have had to restart our router every day up to 6times a day as the internet goes down every time. I refuse to change the password again as that costs me extra money and I refuse to phone in to try and have things sorted out cause a number that is supposed to be free gets charged and you get placed on hold for a long period just for them to reset a password. Telkom sort your stuff out or you will lose a client to another service provider. Also what angers me is that we pay for a 4mbps line but only get maybe if we lucky 2mbps and I dont care how far I stay from the so called switch I am paying for a 4mbps line and expect to get 4mbps and not below 2mbps. Sort it out within 7 working days or lose a customer.