Seized Engine with only 79,000 Miles

Of course, I checked the oil and it was full. 2-the battery wasn’t dead but I know what a battery sounds like when its dead or not. 3-I called the dealer immediately when the oil light came on and they told me could be that I had no pressure due to just getting gas and the gascap might not me tight. 4-I pulled over immediately upon seeing the oil light come on, checked the oil, and the light went off. About a mile later, the light came back on, and two miles later the car stalled. 5-I called the dealer about the warranty as well, and for your information there is a 5year warranty for the first owner up to 100,000 miles, not the second owner. 6-I posted this for help not criticism. Thank you for your time.