Service sucks, Making debit orders from my account

Really I am not happy with this Blue Label Connect Company, they are ****** they ***** my money meanwhile I am done with their contract, when ii asked them to reverse and refund me they still had the nerve to ask me that I should send my bank statement and copy of my ID as if that is not enough the phone is broken and its not even working and they sim card is no longer active, I am so so angry right now, when they get into my bank account and take my money, I cannot even reverse it myself as its a debi-check. What ****ed me off is that my bank app is offline right now, and the bank charges me for the statement they require from me, first of all i want to know why did they have to take money from my bank account when they definitely knew my contract with them is finished after they tell me its a mistake, which cost me again, I would like to advice that don't ever take a contract phone with Blue Label Connect no matter how desperate you might need a phone.