Engineers are employed by Openreach which owns the cable network, not Plusnet who can only make the appointments and hope Openreach will turn up on time. There seems to be quite a few broken appointments at present, but individual customers cannot contact Openreach, you have to go through Plusnet.
Plusnet staff do monitor this forum but I would phone them if I were you. Long waits are annoying I know but you should still find it quicker. Have your details handy. Good luck!
Edited to add: @SpendLessTime beat me to it!
FURTHER EDITED: Openreach staff were on strike yesterday, see my separate post
Mike
