Ah quick disconnections.
OK first thing to do is eliminate your equipment from the equation - try another dialup provider briefly - there are a few 0845 accounts anyone can use. If you can hold a connection without any problems it points to an issue at our end
I need to know:
1) Are you using an ntl or a BT phone line?
2) What are is your area code and prefix (all your phone number bar the last 3 digits should be fine)
3) Are you able to surf ok for a while? (This will prove if you are authenticating ok or not)
From these I can see what you are connecting to at our end, and will check it out or will pass to the appropriate people to look at.
Thanks
JAN. (Considering changing sign-in name - feel like a bit of a fool signing posts as JAN when I am in fact male

)