Cancelling policy - can't get hold of anyone

Hi there. I have tried to get hold of you for over a week already to cancel my policy. You do not respond on emails, you do not respond on your website queries, you do not answer your phone. What if I needed to claim? This customer service is extremely unprofessional. I have already paid my car off, but you continue to debit my account. This account/policy need to be closed, effective immediately. Please contact me urgently.