Sex slave claims labelled a 'sham' SIX women on student visas who barely spoke English were forced to work nearly 20 hours a day in a Sydney brothel as sex slaves, a District Court jury was told yesterday. But the lawyer for their alleged madam, Chee Mei Wong, 39, claimed the whole case was a "sham" - designed to allow the Malaysian women to remain in Australia. The court heard the women had been recruited to work for a lady named "Yoko" in the Diamonds brothel at Willoughby. They were enrolled in courses to obtain student visas and allegedly given "show money" to fool officials into believing they could afford to live in Australia. Crown prosecutor Carolyn Davenport SC said Wong - the madam who was using the name Yoko - told each of the women when they arrived they had a debt of about $5000 to repay. "They were also told when they arrived the list of services they must provide," she said. They were told they must - that they didn't have a choice. The women allegedly serviced customers seven days a week until the early hours of each morning.