Depending on my lookup, the overall HDB hotline is 1800-225-5432 . This is a Branch Office environment Company Line that operates on weekdays from eight:00 AM to five:00 PM. Also, there are actually other contact numbers for specific services: * HDB Main Line: 6490-1111 (for general enquiries, weekdays eight:thirty AM https://hdbtowncouncilhotline210256555.ampblogs.com/hdb-town-council-hotline-210-22-73857075