When will I get my refund if I don't receive the IPO's allotment on a listing day?

When will I get my refund if I don't receive the IPO's allotment on a listing day?

According to SEBI (Securities and Exchange Board of India) regulations, the company issuing the IPO (issuer company) is required to refund your money within four working days of the IPO closing date. Failure to do so may result in penalties and interest payments for the issuer.