Hong Kong - Singapore - Perth. We flew from HKG to Singapore originally at 11.05am and should have taken the second flight to Perth at 5.50pm. Jetstar delayed the flight for 7 hours due to 'adverse weather and operational reason'. Flights of other airlines had the planes boarded to Singapore with at most 1 hour delay. We finally could not catch up the second plane and were forced to stay one night in Singapore with no accommodation provided. Staff were not helpful and made us confused. We arrived Perth with a 24-hour delay with no luggage. We called the so-called 'hotlines' and the people there said they are not the customer service department staff and we could only complain by email. Finally we were back to Hong Kong and sent an email to Jetstar.