Brian Gaff was thinking very hard :
Its laziness and sharp practice to hide them in this way.
So many people who offer services these days have nothing to do with
internet services but have merely gone down the online route with no contact
telephone number.
It is discriminatory, since many many do not have web access.
I'll get off my soapbox now.

Who bothers to read them anyway?

Plusnet do seem to insist on their people actually reading out the
terms of their contract, when you agree to a contract - not a
recording, but an operator reading in out and rather pointlessly,
because they speak so quickly, you do not have time to absorb it.