Incorrect R15,000 Debit Card Charge

While travelling in the US, flying Delta airline, I was charged R15,000 for a flight and not allowed to board due to my South African debit card not passing their security check and therefore not issuing the ticket!<br> <br> After numerous attempts to contact the airline customer service division failed, I was forced to dispute the transaction (in August 2014). I have been back and forth with FNB/RMB and my account is now overdrawn due to this charge (I had to repurchase another ticket to travel)! This transaction was incorrectly charged to me and needs to be refunded as a matter of absolute urgency (with interest)!<br> <br> I am at the stage where I don't feel safe using my Debit card, especially while travelling!