I had it and had all sorts of problems, eventually gave up and went to BT infinity, with TV and been perfect since.
No matter how much it's debated they can all be crap when things go wrong, it's pot luck.
See my earlier post, I switched from O2 to Vodafone 3 weeks ago and have experienced...
My neighbour works for them, will ask later
Your experiences with customer service are similar to mine with Vodafone. For the first time in 15 years I ported my number, but the voicemail file has been "lost" and I'm totally confident nobody is doing a thing about it. For some obscure reason...