What do I do now?

I sold my old car to a friend of my dad's last year.

I DID fill out the title transfer form and mail it in.

I get a letter today saying to remove my vehicle before it gets towed.
This leads me to believe that the vehicle that I no longer have,that I transfered the title on, is STILL in my name.

Letter says it is parked in front of a property and needs to be moved or it will be towed. Which leads me to believe that I now have tickets in my name.

I no longer have the car.

What now?
It's after hours

Always something 😩