Spirit Airlines
Charged twice for ticket and refund never deposited

I purchased an airline ticket online from their website, due to system error they charged me twice. I called them immediately and they admitted their mistake and told me that I have been refunded money for the 2nd ticket. I waited about a month and called them back, then they told me that it was not done at that time and they will do it now. Since then I have called about dozen times. They keep on telling me that they have refunded money but there has been no money deposited in my bank account. I have my bank statements as a proof. I just don't know what to do. I cannot imagine in United States someone can do this. I don't know whom should I contact. Any feedback is appreciated.

Company: Spirit Airlines
Country: USA

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