In the message, the 25-year-old man had provided information about the girl who he had met during his visit to the red light area.
He was then called to the DCW office where he provided more details about the girl's whereabouts. The commission then contacted the police.
A team of Delhi police and DCW officials rescued the victim from brothel number 58 late last night.
"The victim said she was a native of Bihar and that both her parents had expired while she was very young," the DCW said in a statement.
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"The girl said she was kidnapped from her aunt's house by an unknown woman who sold her to the brothel owner at G B road at the age of nine. She was asked to entertain her first customer at the age of 11.
"When she tried to resist, she was tied to a pole and brutally beaten up. She claimed to have been raped by five different men and since then she was forced to sleep with men every night," the statement said.
The victim had expressed her desire to escape with this man who had visited the brothel. But the brothel owner overheard their conversation and the man was beaten up.
"He is the same man who informed us about the girl," said a DCW official.
In her statement to police, the victim said her life was in danger and that she wants to take legal action against the owner of the brothel.
The Delhi Police is yet to register an FIR in the matter.