Internet Axxess denied to business client

We're a 4 Mbs "premium" ADSL business client of Axxess and have repeatedly had very slow or no internet and email connectivity - the line is hosted by Axxess, who throttle our business back despite taking our monthly dues and that we DO comply with reasonable use practices.

This is not acceptable and I call upon tAxxess management to review their support services and breach of contract.