Based upon my look for, the final HDB hotline is 1800-225-5432 . It's a Branch Business office Company Line that operates on weekdays from eight:00 AM to five:00 PM.Additionally, you will find other Make contact with figures for distinct expert services:* HDB Key Line: 6490-1111 (for typical enquiries, weekdays eight:30 AM - 5:00 PM)* Important