I booked to Cyprus, paid for 3 seats, and extra bags (Arriving & Returning). Wizzair informed me my return flight to Gatwick had changed to Luton. I informed them I could not go to Luton; they rescheduled back to Gatwick, leaving the next day. I made sure to confirm my paid seats, and extra bags were included in the rescheduled flight leaving the next day, which I was reassured all the details would be carried over. I tried to check in the night before leaving but was unable to as my seats were not available. I went to Larnaca airport, assuming I could check in at the desk, but was informed there were no seats available as the airline had overbooked the flight. I had to pay (150 EUR extra) to check in and go on the standby list with no guarantee we would get on the plane or be seated together (two kids under 10). As there were no Wizzair staff, only airport staff, they were limited in the information and just referred us (2 other families also) to the Wizzair site.