Watch the story tonight on 20/20 at 10 p.m. ET
"They showed no interest," said Davis in an interview for broadcast Friday on the ABC News program 20/20.
"Some of these guys, I was invoicing on corporate credit cards," she said. "I was writing up monthly bills for computer consulting, construction expenses, all of these things, I was invoicing them monthly so they could get it by their accountants," Davis said.
A spokesperson said district attorney Robert Morgenthau had "no comment" on the handling of Davis' case or her allegations.
Davis provided ABC News with a print-out of her computerized client list, the same one she says that was offered to the district attorney.
The document shows Davis kept meticulous notes about her clients, their credit card numbers and mobile phone numbers.
Among the names ABC News was able to confirm on the list:
Manhattan Madam Says Clients Had Payments Disguised
Some of the men contacted by ABC News denied they used their corporate cards, and ABC News could not independently confirm if the credit card numbers listed were corporate accounts.
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Davis says one CEO ordered her to send him invoices for "roof repair on a warehouse" to disguise the payment for prostitutes from corporate funds.
"That is fraud," said former New York prosecutor Sid Baumgarten, who told 20/20 the district attorney should have investigated the men.
"Not necessarily just for the patronizing but for the use of these business records and credit cards to see what kind of fraud or tax fraud was being used. And if so, that is a major offense," Baumgarten said.
Brought Down After Revelation of Client #9
Davis operated her escort service as a prostitution conglomerate, with five different "brands" over a four year period, each with its own "price point" and websites.
At the high end was an escort service called Carlyle Trust, mimicking the name, but not connected in any way, to a prestigious investment firm. Davis said she recruited top fashion models who charged up to $2,000 an hour for clients of Carlyle Trust.
Her lower cost services charged $400 an hour for a "body rub," she said.
The "best little whorehouse on Wall Street" was located just a few blocks from the New York Stock Exchange, in apartment 3A at 136 William Street.
Davis operated three other "in-call" locations in the mid-town area of Manhattan.
The escort business took in as much as $200,000 a week, Davis estimated.
But it came to a screeching halt last year in the crackdown that followed the revelation that then-New York Governor Eliot Spitzer was client #9 of a rival escort service.
In a book to be released Feb. 20, "Manhattan Madam," Davis claims Spitzer had earlier been a client of her service but was banned because of his aggressive behavior trying to get girls to have unprotected sex with him.
Treatment Not Fair, Madam Says
In a plea arrangement, Davis pleaded guilty to promoting prostitution and was sentenced to three-months time served. She forfeited about $500,000 in profits as part of the deal, according to court documents.
Watch the story tonight on 20/20 at 10 p.m. ET
"I, as the proprietor of a business get arrested and lose everything, when no one that was frequenting my business, spending $200,000, $300,000 a year, has been punished in any way or even looked into."
She says she has not yet decided whether to release the full client list to the public.
Kate McCarthy and Andrew Sullivan contributed to this report.
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