[MovedGoalPosts]

This is a fact of life that many many companies offer incentives to make potential customers take on their services. These incentives are usually short duration. If you look at many of the ADSL ISPs they have similar new customer offers too.

The only way you might get an offer out of ntl as an existing customer is to threaten to leave (and you can only do that once your 12 month minimum contract has expired). It may then be a case of brinksmanship as to whether you get a deal you like.

It's not just broadbadn that works like this, mortages are another example (Nationwide are promoting heavily against that). All these incentives tie you into a minimum full price deal after the initial discout or other enticement.