Based upon my look for, the final HDB hotline is 1800-225-5432 . It is a Branch Place of work Assistance Line that operates on weekdays from eight:00 AM to five:00 PM.Also, there are actually other contact numbers for specific solutions:* HDB Primary Line: 6490-1111 (for basic enquiries, weekdays 8:30 AM - five:00 PM)* Critical Routine maintena