There is nothing even remotely recommendable in that price range. You're looking at a minimum of 3000 INR simply for a mediocre one, such as the Corsair VS PSUs.
Unfortunately, you'll have to get yourself a new PSU.
Trying to use less pins than required will cause damage on any PC part, so i'd advise you to not try it.
Suggest me cheap and best PSU in india market site :/
We're going to need a lot more information than this, such as your PC components and your budget. Without any insight as to your needs, we can't give you specific, good advice.
There is nothing even remotely recommendable in that price range. You're looking at a minimum of 3000 INR simply for a mediocre one, such as the Corsair VS PSUs.