hmm, why then do I have a shiny, only used once modem, sitting here in my office that I had to rush out and buy because no one would believe me the ADSL service was broke

Worse even once proven by me it took a week for BT to get off their backsides and resolve it despite continuous pressure from me and (reluctantly) my ISP.
Call out charges are all well and good when they are justified and viable. This seems like a bit of a hike against a clientele that are being held over a barrel.