I am almost 100% sure the problem with the connection is the drivers. Hear me out and give feedback...
On Saturday, the connection dropped (the icon was showing that I am connected to the internet, but I could not open any web pages) and out of interest sake, I opened up the device manager (Windows XP) to see if anything funny popped up. Very interesting was that the DuPoint modem had an exclamation mark. I opened up the properties and noticed that "windows had a problem with the device drivers". I tried to update the drivers, but was unable to update the drivers because the drivers come with NeoManager, which is in *.EXE format....
So I went through the whole process of un-installing anything relating to Neotel, and re-installing NeoManager (as far as I am aware, there is no other way of installing the device). After installing the device, I tried NeoManager and changed the dial-up settings to "automatically reconnect if the line is dropped". Throughout the weekend, the connection continued to drop at regular intervals, requiring me to disconnect and reconnect.
I am of the opinion that there is a conflict in the drivers between Windows and the NeoManager.
I have tried to phone Neotel for a better understanding, but the call center is apparently busy. I have sent a mail and will see what response they give...