Hanover Insurance Group review: Insurance company to be held accountable for causing unnecessary stress & personal grief.

Received confirmation that my insurance policy was canceled 6/22 after providing proof of other insurance and turning in old plates in my new state of residence.

Received a bill 9/22 for months of July-September.

Insurance company contacted my ex wife demanding payment despite her name not being on the account for the previous two years.

How can a company contact someone not on my policy demanding payment?