Jetstar flights from Auckland to Maroochydore (AKL - MCY)

Jet star made me pay $325 in extra baggage fees after I showed the agent that I had been trying to add extra baggage to my flight for two days prior. Each time the website declined my payment without explanation. I had no choice but turn up without pay for extra baggage. I showed physical proof that I has attempted numerous times the previous two days to do so and the payments were cancelled. Not declined as there was ample funds on the numerous cards that I tried. The website was faulty and they still decided to do nothing about it. I know that I sound like and entitled passenger but I assure you. I did everything possible and within my responsibility as a passenger and they ignored me. I will never fly jetstar again.