No cancellation effected

Momentum please refund me. I do not want to have to take this up with the insurance ombudsmen. I took an insurance policy with you people on 27th March. On the 28th I found an alternative I preferred, and cancelled with you via email, as you dont seem to answer phone calls. Now, today 2 April I see you have not cancelled, as you have taken the debit order anyway. Please refund urgently