A spokesman for Stagecoach said: “We’re very sorry that a pupil was inconvenienced.
“We work very closely with Kent County Council to put arrangements in place for the start of term.
“This year, like any other, we made special arrangements for pupils to travel without a pass or ticket for the first full week of term. We applied an extended grace period beyond the date specified by KCC, so that any pupil who had not received a pass would be able to travel.
“From Tuesday, September 15, we expected any pupil without a valid pass to pay the appropriate fare.”