Ah, OK.
Most unsatisfactory.
I’m told the 8-8 is incorrect, but it is still only 8am - 11pm, so 15/7 at best.
We might hope that the service is monitored 24/7, even if no-one is there to answer the phones, but I think this limitation is something that should be in the literature that potential customers get when deciding who to switch broadband suppliers to, so they can decide if this concerns them or not.