Unauthorized Debit Order

I have an old mutual debit order that went off my account. I dont even have an active policy with you guys. Who do i contact for a refund (as i had to pay a fee with my bank for an unprovided for debit order and thus lost money that was sent to me) . ALL FOR A DEBICHECK MANADATE THAT WENT OFF MY ACCOUNT UNAPPROVED BY MYSELF. THIS IS *****!!!! WHAT KIND OF ORGANISATION IS THIS? I DONT HAVE ANY ACTIVE POLICIES OR INVESTMENTS WITH YOU. WHO APPROVES THE USE OF MY BANK ACCOUNT WITHOUT MY CONSENT??!!