Ridiculous effort to cancel policy and get pro-rata refund

Getting comprehensive insurance on my vehicle was a pleasure. HOWEVER I traded this vehicle in and took out insurance from another company. When I phoned to cancel my policy I had to first talk to a retention specialist. They just could not cancel as requested and kept on asking questions like where I insured my car and for how much. Then they tried to tell me how wrong this will be and and and...After that seems forever they agreed to cancel my insurance. For the pro-rata premium refund it was another painful experience. First they wanted proof that my vehicle was sold...why? No other insurer ever wanted this. When I send them the sign SARS document that the dealer gives you for tax purposes( that you only get when you sell a car) with the vehicle details, they firstly just send it back because it was not in the correct file format (although they could read it). After sending it in the requested format, they just declined it and want a ENantis document to proof I sold it. I even gave them the dealership number to comfirm I sold it. After sending a official letter from the dealership to proof it was sold, I am still waiting. Cancelling the policy should be good enough and I still do not understand what it has to do with them what I did with my vehicle. I do not even want to imagine the effort and excuses if I actually had to claim something. Never ever will I deal with them again.