Leave Flight Centre alone. Book online. They made my trip a complete nightmare

The first agent we dealt with assured us we would be able to make changes to our flights. She transferred to another branch a day later but assured us she would hand everything over. Well she didnt. When we went in to pay, fistly, it took nearly two hours(we got an apprentice) the guy told us there was a huge penalty for changing our booking. Then, after checking in for our flight and hours and hours of delay, the original person INTERFERED with our booking online. Our flight was cancelled and because of her interference, even the airline couldnt make changes. This resulted in a TWO DAY DELAY before we could get another flight. NOW, 5 weeks later, I CANNOT DO AN ONLINE CHECKIN to go home because of what she did to my tickets. We are going to have to sit in bad seats for TWO TEN HOUR flights. Will never use them again, the worst possible experience from any travel agent EVER