There's banging on the front door of your house where your children are asleep.
'The smoke billowing from your roof is soiling the clothes on my line!' a voice yells.
'Put it in writing,' you yell back. 'And send it to my landlord. She'll let the owner know.'
'Well, contact the fire brigade!'
'Would you agree to me passing on your complaint to the fire brigade?' you shout back.
'No. Just stop smoking out my clothes!'
'Would you be happy if I dry cleaned your clothes for you?' you yell.
A van draws up alongside while you're at the traffic lights. The passenger rolls down his window and points at the back of your car.
'Is that a formal or informal gesture about my car?' you say.
The van pulls away as the lights turn green.
'Anonymous!' you mutter under your breath, before accelerating away in a belch of oil smoke and sparks from your dragging muffler.
You catch up to the van at the next set of lights. The passenger repeats the gesture with more animation.
'Vexatious complainant!' you sneer as you raise your middle finger then the volume of the radio.
Organisations pay for opinions - usually called 'feedback' - of customers, clients, employees and random strangers about their Widget.
They hire different people to deter, defend, deflect, delegate, mediate - opinions that are called 'complaints'.
A complaint is information about your Widget from someone who cares enough about their Widget (which may be the same as yours) to give it.
It's your decision - not theirs - serving your Widget - not theirs - as to what you do about it.