The same thing happened to me when I was living in central MA. I found a cheaper insurance policy than the one I had so I bought that one and let the old one expire. The old insurance company had the RMV pull my reg. even though it was perfectly legal. I found out when a town cop nabbed me about 3/4 of a mile from my house. The admitted the mistake but I still had a moving violation on my CDL,Two days taken off work for court appearances, A $350 tow charge and $50 of storage even though the car was in the pen for less than an hour.
Mandatory insurance is just another Statist scam
Back in the Day b4 computerization I had three driver's licenses - Ala., N.Y. and Mass.
NY didn't recognize Ala. and Mass. was receptive to an Ala. license, but didn't revoke it (I later turned it into a Calif. license, but moving around slowed down and as the odd ones expired, I ended up with just one).