Hi,
X borrows a sum or Rs.1,00,000/- for his family expenses from Y. X signed a blank promissory note while receiving the amount. After 6 months X repaid the amount. But Y neither return the pro-note to X nor cancelled it. After 2 years Y files a money suit against X claiming Rs.4,00,000/- towards principal along with corresponding interest. What are the defences that X has as against Y's claim?