The problem here is that, unlike many of your clients, I am NOT stupid. You are an Internet Solutions reseller. The network, at work, is giving the same issues at the same times. I think your hands are tied and you are limited in what you can do, as IS especially have an attitude that they are the cat's whiskers and screw you, even if you're an ISP reselling their rubbish.
At work, we run servers on public IPs, and these issues, wreak havoc with my projects. I have taken the opportunity with the fact that we're moving office to get MWEB business installed. Why? Because it works, when you need it. The issue with the hard/soft capping is not an issue here, because if I catch people using torrents at work, there's trouble. Since we know what the AUP is, if big downloads are required, we can plan for that.
I recently spent two weeks chasing a bug in my code, and it was not a bug, it was Internet Solutions!
I am going overseas really soon, and last night, I really battled to get into the corporate e-mail system... Disconnected the ADSL, plugged in the Vodacom 3G and got it right away!
All my life long, IS has been the bane of my life, they are the worst ISP I have ever come across, I would much rather use iBurst if there was no other option in this world.