Ajmer: A 72-year-old Ajmer resident was allegedly duped of Rs 3,98,500 after sharing a one-time password with a caller while trying to book a doctor’s appointment, police said.Wali Mohammad, a resident of Shalimar Colony, found a hospital number on Google and made a WhatsApp call on Oct 14. The caller said he needed to register for an appointment and sent an OTP through WhatsApp. Mohammad, believing it was part of the normal booking process, shared the OTP.The caller said Mohammad would be informed about the appointment. However, money was withdrawn from his bank account and his message service was blocked, leaving him unaware of the transaction.On Oct 18, Mohammad received a message saying his message service had been blocked. He checked his UPI account and discovered the alleged fraud. He visited his bank on Monday and lodged an FIR at the cyber police station on Tuesday.ASI Vindo Kumar is investigating the case. Police urged people not to share OTPs with anyone, warning that those seeking them could be online fraudsters.