Insulting British callers

[ZenGum]

...found that 77 per cent felt "very" pressurised and 45 per cent identified difficult customers as the main source of their stress.

And the other 55% identified...?
middle management being slave driving jerks who can't manage human resources? senior management setting unrealistic performance goals? Being made to work next to that rude bastard Ravi who always smokes and smells bad?