Complaint Review: Credit Collections Services

I cancelled my car insurance but still kept getting bills. Next I get a letter from a collection agency. I told them I canceled and was with another company. They said I had to give them proof I had insurance. That my agent should call them. Like that's his job.  I continue to get bills from this credit collection service. When I tried to go to their website I was redirected told that site was unsafe. That's how I got here