Refusing to cancel my insurance

I asked King price yesterday that I want to cancel my policy. They only phoned today after I asked again. On the recorded line I told them I want to cancel the policy without questions. They are refusing to assist unless I tell them why. This is creating a post sales barrier to cancelling a policy. If a person says they want to cancel the policy - you need to do this. I have asked on EMail, SMS, on the app and a recorded line and still my policy is not cancelled. King Price please send me my proof of cancellation and stop harassing me.