After moving out of California [closed]

Just received a letter from Tollroads saying that the car I already sold a while ago in California has recently made 24 violations in Orange County and I need to pay $2000. But I had already moved to the UK and CarMax should have transferred my title and California DMV should be aware of it. Apparently they are charging the wrong person. Now Tollroads doesn't want to right the ship and I'm abroad.

What should I do?

OK I found my own solution now:

1. I called CarMax which purchased my car and resold it. They sent me an electronic document stating that my liability had been detached.
2. Then I forwarded this email to customerservice customerservice@thetollroads.com and included my personal information (licence plate, address etc.)
3. Then I called tollroads three days later to urge them to proceed （it takes time for tollroads to manually upload the information).

Now I've received their email saying that they have transferred the 24 violations!

My approach is not involved with DMV. Hope the current car owner doesn't violate other ruls before DMV finishes the long long process to transfer my title in California.