Impossible to cancel policy

I have sent repeated emails asking for both my Auto Top-up and life insurance policies to be cancelled but, more than a week later, I have still not received a response. These premiums had better not be debited from my account next month! I have the emails on record to show that I sent the cancellation requests to ********** as I was instructed to do by the call centre agent that I spoke to. This is the second time that I am struggling to have a policy cancelled with Dial Direct. Lesson learnt!