Sometimes we need to draw the line between the upset customer with a legitimate problem and the chronic complainer who consumes our time with unreasonable demands.stop complaining.
First, make sure you’ve got a chronic complainer.  Here’s how you can tell:

• They whinge about the way others speak and act toward them, and anything else they happen to think of.
• They blame everything on someone else and don’t think about what they do to correct the situation.
• They often fail to discuss their problems with the right people.  Instead, they moan to those who can’t do much to help them with their complaints.
• You’ve tried the usual approaches and nothing seems to work.