How would a normal business react?
As opposed to the fixed "we are still a monopoly" minds at BT who will simply increase prices yet again.
See the recent letter from Warren Buckley about the "useful features of your landline" which on the back and in smaller sized print listed the April increases.. Even smaller print at the bottom tells you those prices are only correct at December 2009.
How many customers are they prepared to lose before taking a common sense approach?