It would appear that the purpose of the HDB’s letter is to inform that somebody might have complained about tenancy matter and officers have been dispatched to find out more.
The best thing to do is to arrange for the visit quickly find out from the officer the area of incompliance and to rectify the situation as soon as possible.
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Circumnavigator, lawyer and columnist and the man who divides his time between Singapore, Hong Kong and China. I believes that etiquette transcends nationality and race. 
In this column I will offer stylish advice to everyday questions on etiquette at work and at home and anything else that may be bothering you.
