A former chairman of the Yan Oi Tong charity is being sued by the group for unpaid fees and entertainment expenses amounting to about $745,000. Yan Oi Tong Limited claims Thomas Lee Mun-kit, also known as Lee Ka-hing, failed to reimburse expenses incurred for attending banquets and balls during his directorship, according to a High Court writ. Mr Lee was a director of Yan Oi Tong between 1993 and 1998 and was chairman in 1997/98 after agreeing to pay an annual subscription of $450,000, entertainment fees of $45,000 and other sums facilitating his 'benevolent services'. The writ says the post helped Mr Lee enhance his reputation and social standing within the community. The expenses incurred during his directorship included fees for various banquets and balls Mr Lee attended, sponsorship for charity walks and television shows and tickets for pop concerts and Cantonese opera. The writ says Mr Lee failed to pay, despite demands from the organisation, which is claiming a total of $743,597.