Based on my search, the general HDB hotline is 1800-225-5432 . It's a Department Business Service Line that operates on weekdays from eight:00 AM to five:00 PM. On top of that, you will find other Make contact with numbers for certain providers: * HDB Principal Line: 6490-1111 (for basic enquiries, https://paulu853sdn4.wikitidings.com/user