Discovery non responsive with cancellation of policies

Having had enough of the general bad and mean-spirited customer service from Discovery insure, I decided to cancel my policy. I did receive a much better rate with similar benefits from Outsurance. Now there is no feedback from discovery about the cancellation of my policy. I’ve sent them 10 emails about the cancellation, hoping to confirm that the next payment will not go off my account but have received only automatic responses. Discovery, I did expect this from you since your service is in general pathetic but you have taken this a step too far. Please just confirm that my policy is cancelled and that you will not debit my account anymore. How hard is that?