chicago SLOOOOOWWWWW 5 cr's 4 techs complete rewire and protensioning NOTHING WORKS get out now

SO a while ago I thought this idiocy was fixed but it isn't. I pay for 16/3 mb and right now it's a crapshoot between 2mb and 11mb. Today has been a real joke as the techs are supposedly monitoring the line ( I think it's called protentioning or something)  I started to look at the speed using ONE machine hooked to the modem ( mine) and at 5am it was 2-3 mb down and 3mb up. I logged a CR. At 9am it was no better another call ( no email availible) and another CR as the speed was about the same.  SO todate three techs have come, one replaced ALL our wireing to the comcast box. Two of them raised this issue to critical as it was hitting other businesses as well and the last CR got the line monitoring in place. NOTHING IS WORKING!!! We, the local businesses are meeting next week to swap stories and see what we can do using our new Mayor, there has to be some milage in him getting $350000 from comcast.  I am finished with tech visits that achieve nothing and filing CR's so if anyone has any other ideas I'd REALLY be happy to hear them. Here are the modem numbers if it is of interest