This sounds like the grumpy old lady in a neighborhood full of young families.

Not to HiJack Ajit's thread, but my mother in law came to mind. She's everywhere, and because she is everywhere, we here about everything.
Ajit, write a "Local Customer Complaint" procedure (and yes, I'm mostly serious). You can "spin" it as though its improving your services to them. Identify the level of risk (or severity) and how often things can be notified. Like SteelMaiden mentioned if it's that your trash cans are not in the right place, they can report such things once a month. If it's critical (and that would be proceduralized) then they can call this person or whatever.
Too, except for critical things, establish a written policy. I certainly am not speaking for your culture, but I would think your customer should be willing to partner more with you and create a better working relationship. It's hard to manage and measure complaints when bob gets a phone call, Ajit gets an e-mail, Jane gets visited by the customer rep, etc. Having one method of reporting may lower the irritation factor also.
Communication is one of the biggest problem-areas in marriage, and can be in business also. Set up a way that they can channel complaints and that don't wear you down to nothing.

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