Very distraught Customer

I was travelling from Cape Town to Aucland New Zealand with a 19hour stay over in Doha via Adelaide to Auckland New Zealand, when the group hostess announced the flight I approached her asking if would need a transit visa to Adelaide, she asked from what country I was from I said South Africa, she said yes that I needed a visa and told me to go up to immigration transfers, I was told by transfers that I did not need one, yet I was denied access, I missed my flight and incurred extra cost in booking accomodation and taxi fees, I missed my hotel booking at the Ackland Kiwi hotel, and missed my flight from Auckland to Whabgerei that was booked for the next day. I submitted a complaint but was met with hostility and was accussed of the one who refused to travel, the customer service agent Mohamed Aly at Qatar informed me that I was the one who refused to travel after investigating and it was concluded that I was at fault and that Qatar is not taking responsibility for my claim