Moved lines and got downgraded without notice

I moved residence and Telkom has moved my line. But my speed has been less than 1mb/s, where I would usually get 3.5mb/s. Without me knowing and without Telkom informing me, my line was just downgraded from 4mb to 2mb. I spoke to some lady and she says theres nothing she can do, and that I must just accept it. I didn't even move to a different area, even kept the same phone number. Please help.