Based on my research, the final HDB hotline is 1800-225-5432 . This is a Department Business Service Line that operates on weekdays from 8:00 AM to 5:00 PM. Also, there are other Get in touch with numbers for particular providers: * HDB Principal Line: 6490-1111 (for basic enquiries, weekdays 8:30 https://hdb-town-council-hotline01009.blogdon.net/hdb-town-council-hotline-210-22-53195212