You guys ruined my first international holiday experience

I made an online payment on the website and the payment authorisation was successful. I was then prompted with a screen the said "Oops! There seems to be no more booking available for this for / Too many people may be booking this flight at the same time. You will not be charged for this." LITERALLY 2 minutes later I get the notification to say that my account has been deducted!. I've contacted the lady working after hours/emergencies about it and she couldn't be less bothered. Her name is Chanelle Moses.

This was supposed to be my first international trip ever and just like that, my savings down the drain.

I'm literally doubting that me venting here is going to be of any assistance, but yeah. Gotta speak up I guess.