I've heard bad things about TalkTalk in the UK, to the extent that I wouldn't want to try them no matter how cheap they are.
Thankfully, the only real downtime I've had to contend with is when I'm switching provider - which I just take on the chin..
That's entirely different, the act of making a hoax bomb threat itself is a criminal offence in the UK under the Criminal Law Act and Malicious Communications Act. I'm pretty sure it would most likely be a similar story elsewhere..
..as for dealing with angry customers - try it. I've been on the receiving end of some nasty, vicious mouthed customers. Having someone describe themselves as being "incandescent" with the company that you represent, wishing ill will on you and your family, and being utterly powerless to try and help resolve the situation. I only managed 8 months in the role..