Everytime I phone them up, no matter what day of the week nor what time of the day, I get a recorded message saying they are currently experiencing a large number of calls and there's a delay of
x minutes. If there's always a large number of calls, why don't they employ more people to answer the phones?!?
.....in fact today is probably the exception to the rule, as today when I try to report the error I have with this month's bill, the line is engaged.

Maybe they've got problems with their phones, or maybe I'm not the only one trying to report an error with their bill.