The tour operator last month apologised after a number of holidaymakers were forced to change their travel plans due to the hold-up.
The 400-room former Montechoro Hotel was taken over by the Jupiter Hotel Group after the summer 2017 season, with Jupiter planning a five-star makeover.
Jet2holidays started taking summer 2018 bookings for the hotel last year but come June 1, when the hotel was due to reopen, the works were ongoing.