Three men were convicted yesterday for their roles in a pyramid scheme fraud, involving $7 billion and 14,000 victims, which has been described as the biggest case of its kind in Hong Kong. Managing director Kwok Chi Kwai, 37; marketing manager Chan Kei-suen (alias 'K.K.'), 29; and the original planner and boss, 39-year-old Tan Lam-chuen, were each found guilty of conspiracy to defraud. The trio, who were in charge of a company registered as Promail International (Hong Kong), were said to have offered annual returns as high as 3,300 per cent. A jury of nine returned a majority verdict in the Court of First Instance. But they cleared a co-defendant, 33-year-old company director Shee Yip-shing. Prosecutor Christopher Coghlan has said about 14,000 members were recruited - from May 3, 1999, to December 20, 2000 - to invest in what he termed 'nonsense' consumption plans that were 'unsustainable' investment plans. Deputy Judge Judianna Barnes Wai-ling adjourned the mitigation and sentencing hearing to today.