There's no public info on a certain "hdb responses sort 1k 28" as this isn't a typical HDB identifier. Nevertheless, HDB provides several channels for responses. The principle approach is with the "Write to Us" e-responses kind within the HDB website. This manner means that you can submit concerns or feed-back, and HDB will reply at the earliest opportunity. For particular challenges as part of your neighborhood, such as cleanliness or servicing difficulties, the LifeSG application and OneService App are suggested since they direct feed-back on the pertinent authorities. HDB also has a temporary Making Support Centre (BSC) for new flats to manage rectification requests within the one-yr Defects here Legal responsibility Time period. For general inquiries, you may contact the HDB Department Support Line at 1800-225-5432.