I have been taking my car out of insurance for ove...

I have been taking my car out of insurance for over a year now, according to them the car still exists and they keep sending bills.
According to the RDW / Road Tax and the papers of deregistration and demolition, the car no longer exists.
HOW LONG do you have to nag someone in the head that the car no longer exists.
Now I just received a message from some rogue collection agency that I had to quickly pay the 300+ euros in arrears before they would make it difficult.
PEOPLE HAVE BEEN WARNED FOR THIS TERRIBLE BUSINESS
1 star is still too much for this company that calls itself customer-friendly and helpful