Can a insurance company renew your car insurance policy knowing of a DUI offense and then cancel it

Question Details:

I did not receive a new insurance policy last month, so I had called them to see what was going on. Since my wife has a DUI they wanted to raise my rates which was understandable. Well since they had what they called "dropped the ball" on it, they didn't raise my rates and renewed my policy at the last rate for 6 months until the new policy renews. A couple weeks later I get a cancellation notice because of my wife's DUI. Can they legally do this?

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