Based on my research, the overall HDB hotline is 1800-225-5432 . It's really a Department Business Service Line that operates on weekdays from 8:00 AM to five:00 PM. Additionally, you will find other Make contact with numbers for particular providers: * HDB Principal Line: 6490-1111 (for basic enquiries, weekdays 8:30 https://patrickk664bpd1.oneworldwiki.com/user