Delta Air Lines review: Missing flight reservation/missing money

i need your help. My name is Richard Alme, live in Atlanta, On August 9. approximately at 6:30 AM I checked in for a flight to Belize, leaving at 10:15. I was told at check in I had to have a return ticket, Belize requirement. So, I purchased one paying cash. However, you don't take cash, so I was escorted to a machine that takes cash and gives a debit card. I have the card, and have looked up the Transaction. It shows the transaction, the money I put in then then the transaction. The flight was for 9/23 and I was told I could move the flight anytime. Problem, I can't find a return reservation for the flight, it does not seem to exist. CARD INFO FOLLOWS:

Starting Balance: $500.00

Available Balance: $14.05

Total Fees-to-Date: $6.00

Total Fees Year-to-Date: $6.00

8/9/2023 6:11:35 AM ReadySTATION Card Purchase $500.00

8/9/2023 6:11:35 AM Fee - ReadySTATION Card Purchase ($6.00)

8/10/2023 9:37:28 AM DELTA AIR 0062134059505ATLANTA GAUSA POS Signature Purchase ($479.95)

The only way to communicate with me is via email. I recently jumped into the Caribbean with my phone in my pocket. Needless to say, that didn't work out well. Please advise.