Maj Gen Apirat Kongsompong , chairman of the Government Lottery Office board, and Rungson Sriworasat , finance permanent secretary, said they have agreed to investigate the top lottery ticket sellers over unpaid taxes on sales of lottery tickets for more than 80 baht. The Government Lottery Office has stepped up efforts to tackle the problem of ticket overpricing by submitting the names of three large lottery ticket sellers to the Revenue Department for a probe into their income tax payments.