Maytree Travel has previously reported issues with attacks on its staff, vehicles and passengers and in February last year said it might have to withdraw services if things did not improve.
She said there would be no services over the weekend but the transport authority was working to ensure that school bus services affected by Maytree's action would operate on Monday in time for the new school term.
An employee, who asked not to be named, said staff had been told a proposed takeover of Maytree Travel had also fallen through and that there was "no point in continuing to run services because no-one is going to get paid".