A business owner thought he was dealing with a government agency, until he was asked to pay $490 to maintain his company information on the database. Only then did he realise it was a ruse.
The man, who wanted to be known only as Mr Tan, received a letter from the "Singapore Company Register" on Nov 12.
The 43-year-old was one of two people The New Paper spoke to who had been sent the letter.
In it, they were told that some information about their companies had not been verified in the Singapore Company Register's database.
They were instructed to use a given username and password to verify their particulars.
The letter said that if they did not do so within one week, their companies' information "will be deleted" from the database.
In Mr Tan's case, he logged on to its website on Nov 13, only to find out later that it wanted to bill him $490 for subscription upon verification.
Mr Tan, who runs a company dealing with home appliances and computers, sent a message that day to the Singapore Company Register entity, asking it to remove his company name from the database.
It complied the next day.
He said: "The company sent a very misleading letter. I gave my particulars to it, only to find out later that it was actually a sales tactic.
"The letter made no mention of this at all."