Double Debits

My account was debited on Friday evening and the amounts went off successfully. Much to my surprise the amounts were debited again lastnight , I cant afford for double debits to have gone off this is going to cause that the remaining debits on my accounts for other accounts be returned. Please check your system and accounts and refund the monies to my account. I signed a debit order form for X amount only anything else being deducted is theft in my opinion. Please rectify this urgently as I have other accounts to also pay and you will not be covering any penalties I have to incur now due to your oversights!