Two personal assistants of British television chef Nigella Lawson and her art dealer husband, Charles Saatchi, said they were treated "worse than Filipino slaves" despite allegdly defrauding the couple of more than US$1.1 million, a court heard. Italian sisters Francesca and Elisabetta Grillo face fraud charges in a trial that has already featured allegations that so-called domestic goddess Lawson hid a long-term cocaine and cannabis habit. Saatchi, 70, arrived at court but there was no time for him to give evidence on Thursday, while his now ex-wife Lawson, 53, is also expected to testify at a later date in the trial at Isleworth Crown Court in west London. Multimillionaire Saatchi's finance director, Rahul Gajjar, told the jury that he confronted the Grillo sisters over their alleged use of the celebrity couple's credit cards to spend £685,000 (HK$8.67 million) on a luxury lifestyle. Francesca Grillo was spending a monthly average of £48,000, while Elisabetta Grillo was spending an average of £28,000, Gajjar said. Saatchi's other assistants were spending a maximum average of £8,000 a month. The sisters bought themselves flights, hotels and designer goods by Louis Vuitton, Christian Dior, Vivienne Westwood, Marc Jacobs, Calvin Klein and other top brands. When confronted by Gajjar, the Grillos were at first apologetic and Saatchi agreed to let them remain in his employment and to keep living rent-free at a flat owned by Lawson, the finance director said. But when Gajjar wrote to them outlining how they might pay off their debt they became agitated, he said. "Lisa was against the proposal and I remember a reference to 'We're being treated worse than Filipino slaves'," Gajjar said. Saatchi and Lawson then went to the police after they failed to reach an agreement with the two sisters. The Grillos deny fraud. Their lawyers had argued unsuccessfully on Wednesday that the charges should be dropped because allegations about Lawson's alleged drug use that emerged during the proceedings had damaged her credibility as a witness. The court saw documents from Saatchi on Tuesday in which he described Lawson as "Higella" and said she was so "off her head" on drugs that her assistants were able to go on spending sprees with her credit card. Anthony Metzer, who was representing Elisabetta Grillo, had said that if claims by Saatchi about Lawson's drug-taking were true it would make her a "habitual criminal". Saatchi and Lawson split after 10 years of marriage earlier this year. They announced their divorce after pictures appeared in British newspapers of Saatchi grabbing Lawson by the neck outside a London restaurant. Lawson, the daughter of former British finance minister Nigel Lawson, married Saatchi, a former advertising baron who now owns London's Saatchi Gallery of contemporary art, in 2003. She has two children from her marriage to journalist John Diamond, who died of throat cancer in 2001. Saatchi has one daughter from his previous marriage. Lawson has made a fortune from her television series and books about food. The second season of the US cooking show T he Taste, in which she features as a judge, is due to air in January.