I'm not allowed to swear on here am I?
They are UTTERLY UTTERLY horrendous. The only ISP i've ever written to OFCOM about.
Maybe if you only have a need to talk to them once in a blue moon you'll talk to someone who cares, but if you have a job like mine when you get to talk to them on a regular basis you'll find a company who has no ingrained customer service expertise, no idea of what the left and right hand are doing, and a management culture of misinformation and obstruction.
AVOID!