Returned a rental at SFO last Sunday and they appear to have lost the car

I took a two day rental from Hertz at SFO last weekend. I returned the car on Sunday morning. When I got there it was really busy, and there were a lot of returns happening. The person told me to leave the keys on the dashboard and I could go, which it typical at SFO. Thankfully as I left I took a photo of the car on the lot, because something seemed off.

The next day I noticed a credit card charge. Then I got a text message saying I still had the car. I called the presidents circle and they said they would get it solved. Today I got a threatening text message from the rental overdue department telling me I had to contact them ... I have spent almost 2 hours trying to get this resolved.

Any suggestions on how I can get it resolved. I am getting really frustrated.