Constantia Insurance is BAD

What a bad experience with Constantia Insurance. I have been with this insurance company for years through my broker. I have claimed and they have paid the claims, now the car has been written off they dont want to pay claiming that if they new that I was once cancelled by another insurance company they were not going to cover me. The information that they are claiming I did not mention, I did mention to them through my broker. However they are continuing debiting my bank account and for what am I covering I don't know and when I call to ask they say they will continue debit until this case is closed. I guess this is a delay tactics. Maybe it is because this car is fully paid I don't know.