Do you have any other cards as well? What is the over all limit on this card vs others?
Think of it like this - you have 4 cards with a combined limit of 100 rs.
Card A - 50
Card B - 20
Card C - 20
Card D - 10
Now if you close card D, there is very little impact on your credit score, but if you close A then there will be an impact.
hope this helped.