An American woman, Julia Yonkowski, who thought she had just $20 in her account, was left stunned after she checked her balance at an ATM and found that she had become a billionaire.
Yonkowski, from Largo, west of Tampa in Florida, noticed the blunder by Chase Bank after she decided to check her balance only to find she had $999,985,855.94 in her bank.
She said she is desperate to return the cash to its rightful owner, reports The SUN.
The deposit has made her the 615th richest person in America.
She has tried to contact her local Chase Bank, yet her calls have not been returned.
She told WFLA: â€œOh my God, I was horrified. I know most people would think they won the lottery but I was horrified.
â€œWhen I put in for the $20, the machine came back and said weâ€™ll give you the $20 but thatâ€™ll cause an overdraft and you will be charged and I said, â€˜oh just forget itâ€™.â€
However, when she decided to check her balance she was stunned to find she was somewhat flush.
She said: â€œI know Iâ€™ve read stories about people that took the money or took out money, and then they had to repay it and I wouldnâ€™t do that anyway because itâ€™s not my money.
â€œIt kind of scares me because you know with cyber threats. You know I donâ€™t know what to think.â€
But despite all efforts, Julia has struggled to reach anyone in authority at the bank.
She added: â€œI just canâ€™t get through. I get tied up with their automated system and I canâ€™t get a person.â€