arcamalpha2004

Whatever the " overcharge " is I would guess you are legally entitled to a " cash " refund if you want to push the matter.

I mean if you bought a tin of beans from joe bloggs shop and they charged you £1 instead of 50p and you protested is it ok to just palm you off with another tin of beans?

You state the new contract was " unrequested " as far as I know NTL can send you new conracts as they seem fit.
Whether you stay with NTL or any company for that matter is up to you.
The contracts are a size fits all cases thing, where say you may have fulfilled your minimum 12 months, mr smith down the road may not have, you can cancel if you so wish, if the changes in the contract relate to service charges then you can cancel the account even if you have not had them for 12 months, but you must inform them within 30 days of you receiving the increase demand.