I bought a car for spares and on the day of purchase I checked on the DVLA website to make sure it was declared SORN as the seller informed me it was.

Today, almost two months later, I've received a letter saying I owe nearly £35 in unpaid tax, even though the car is in pieces. The DVLA said that once a vehicle is sold the SORN declaration becomes null and void and the new registered keeper has to do it again. Is this correct?