I was on time for my flight on 22 March 2019 at Melbourne Airport to fly to Syndey on JQ530. Jetstar's check-in kiosk was not working and I asked for assistance from the Jetstar employee near the kiosk. They checked my ticket and asked me to stand in Line to get my boarding pass from the Customer Service desk. I had to wait 20 minutes to reach the desk as 6 people were ahead of me in the queue. As a result, I missed my flight as Jetstar sold my ticket to someone else. Then, the Customer Service desk asked me to leave as they could not help me. I made a complaint to the Jetstar complaints line and to the Airline Advocate. I provided them a snapshot of my Google maps that showed that I was on time to the airport. I also asked them to obtain CCTV footage to state that I was there on time. If Jetstar does not have enough staff to assist on the Customer Service desk then why should customers have to suffer? The two people of the Jetstar customer service desk named "April" and "Tina" were very rude. SHAME ON YOU JETSTAR! CUSTOMERS PAY YOU TO FLY WITH YOU. TREAT THEM WITH RESPECT OR THEY WILL NOT FLY WITH YOU. CUSTOMERS FARES PAY FOR YOUR WAGES REMEMBER THAT. IF Y OU TREAT THEM BADLY. THEY WILL NOT COME BACK TO YOU. I have flown selectively with Qantas and Jetstar for 25 years. I will now get rid of my Qantas frequent flyer points and only fly Virgin. I will be loyal to Virgin as they helped me when Jetstar and Qantas dumped me.