I need understanding on my recent overdraft interest calculation

<p>Please kindly advice how my overdraft interest was worked out this month.</p> <p>My understanding is its 17% p.a up to 24th. Now I reduced it to 59.5 a few days before 24th which should have been calculated on this and not on the old limit. I strongly feel that the interest you charged is incorrect because when I do my own calc it's comes way less than what you charged. Please review, help and let me know. </p>