A petty issue

Have you noticed how you're getting short-changed at the shops nowadays?
Every time I go to a provision store or a supermarket, I'm handed a bill which totals up to an amount that has been rounded off... almost always to the next highest 50 paisa denomination.
I get bills for xy Rupees twenty-eight paise or sixty-nine paise. I mean , come on! Is a proper change for such amounts even existent in our currency?