cancellation of service is impossible

Hello. I want to stop Creative Email billing. We are no longer using your service. We have not found a way to cancel the service. We continue to pay bills but those bills are not legal. It is not charging taxes at 21% but we do not know the name of the company or its tax information. In your administration panel we do not see how to cancel the account. We are very worried. We need you to contact us urgently.