I think we are misunderstanding each other. It sounds like you think I am saying it's ok to reduce speeds BELOW what you are paying for. That is NOT what I am saying. Yes, that is wrong, and clearly a bait-and-switch. What I am saying is that if we offer a 1.0 CIR plan, and when they first sign up their router/AP is unmanaged or we have a surplus of bandwidth (yes this does happen, some data centers have a minimum purchase like 10Mb/sec sustained) and they get 3.0 Mb. Then as we get more customers on the AP, we have to make sure that everyone gets their CIR, so we lower the MIR down a bit to 1.5. If you lower the cap, then it gives other users more availble bandwidth overall rather than killing the AP. This is common sense, I believe.
Sorry to have mislead you in my previous post. Yes, lowering the speed to LESS than what you're paying for is uncalled for and should be brought to their attention immediately if you see this. However, if the ISP lowers the speed from high (3.0) to what you are paying for (1.0) (and not less

) then you have nothing to complain about.
And yes, you are correct, 800k is not 1024k. I would complain too.