A Hong Kong green minibus operator has offered refunds to passengers who were overcharged on four routes by up to HK$1 per ride between May and July. Passengers who paid more they should have for their trips on green minibus routes 501A, 501C, 501K and 501S between May 19 and July 16 may get a refund from the operator, Fully Mint Limited, starting on Monday, the Transport Department said. Fanling routes A probe was launched by the Transport Department last month after the green minibus operator charged passengers higher fares than the price approved by the government, with the differential ran…