I was left fuming yesterday after my November bill was almost double that of previous months. This was because BT had made an error on all of my other bills by not charging me for the entertainment channels. But, incredibly, they had applied a discount to those channels which they hadn't been charging me for! So they sneakily added £27 to my November bill to try to recoup those charges. Most respectable companies would have let it go, as it was their error, and just corrected any future bills. But no, BT insist that I must pay these backdated charges. Needless to say, I have now cancelled my contact. But I am concerned about the implications as I'm only 5 months into a 12 month contract and they have issued an early exit charge of £350. Can I claim that they have broken their own terms and conditions and leave penalty free? Has anybody been in a similar situation?