@Hellaquin Quite simply, because they already have you on their books. ISP's are not stupid. They know some customers will not leave because it's literally, the better the devil you know syndrome. Some customers are literally so loyal, going elsewhere just isn't an option for them. Some customers are bone idle lazy to change and money literally is no object, so they'll just keep paying inflated sums. Some now feel as though they've limited options because of the requirement/need to retain a landline which some ISP's no longer offer.
So, you speak to BT and you try to negotiate. You'll probably spend ages on the phone tooing/froing until perhaps, you get a price acceptable to you. Some customers however call up and are seemingly clearly told, no chance, the price is what it is. I just had this with my home buildings and contents insurance. Found a policy cheaper with a comparison site with the same company I'm already with, £100 a year cheaper. Insurance company says no when I call them with my evidence and they bluntly tell me that the price is what it is. I go to a local broker, they find a policy equal to my existing policy with the same insurer and I buy it through them £80 cheaper than my renewal price. My point is, they're all at it, basically you feel like you're being mugged off.
If renegotiation doesn't work with BT and you've pressed all the buttons via One Touch Switching for example, then almost guaranteed, you'll have them calling you almost immediately to offer you something I suspect akin to a new customer deal. This is exactly what happened my last BT contract expired, though I was in no mood to speak to BT at all and so I defected to their offspring for 10 quid a month cheaper (at the time) and a Reward Card.
Out of contract, the ball is in your court. Much easier for some of us who don't want/need a landline.
Any other issues that might be a stopper to switching that I've not mentioned.
