Who's the registered keeper of my old car?

Alexandra,

When you buy a car, you get legal rights on the car. So if you own the car you're talking about, then nobody can sell the car without your consent. If someone has done this to you, then you can file a police report and start a suing process to get your vehicle back.

Now when you sell a car, normally you would send your registration document to DVLA to inform them that you are no longer the registered keeper of the car. If you don't do that, then all offences committed with the car will be sent to you instead of the new person who has bought the car because you are still associated with the car on DVLA's database.