..........................when call centres say "we are currently experiencing high call volumes at present" because everyone you phone says this, even when they answer immediately.
I reckon it's just a way to get people to give up and hang up.
Oh and don't get me started on "you can find the answers to your questions on our website" which is absolutely not true, because your shitey website is the reason I'm calling you today.
Looking at you, Scottish Power.