Re: How you go about it.
It's how you go about it. If the customer bad mouths you, and they literally are asking your butchers company to provide kids kites, and the rest of the customer know this when they complain, then yes... the rest of the customer quietly say nothing to the nutters,
If you scream at them because they constantly asked for discounts? Then you'll loose customers.
Sometimes there are quiet and simple ways to move the customer on ("We don't support MacOS here anymore" as an example ;) ).
Biting the hand that feeds IT
