********!! Account Debited Twice after Settling

I settled my account a day before debit order went off and took a screenshot of the payment and quoted my ID number, the account was updated accordingly, but a two days after they debited my account with an amount that I had previously owed(which was paid in full and updated) sent two emails to both collections and customer care mail accounts however no response was made, I attached a transaction list of the payment made and their loan statement stating I owe them nothing but they have not refunded my account, I am so angry at these ********. I WANT MY MONEY!!