DOUBLE DEBITS

I changed my banking details for my TFG account way in July way in advance and I got confirmation emails that this was done. In August I was debited by TFG for my makharms account ********** ********** 33737 on BOTH the old bank account number and the new bank account number I changed to. I raised this up and after 5 weeks of no response I was given a reference number 09173F7EC and nothing happened since. Instead TFG HAS DOUBLE DEBITED ME AGAIN IN SEPTEMBER!!!! I want you to stop debiting me on both accounts I changed my bank details for a reason!!! I WANT A REFUND FOR THE BANK CHARGES I HAVE INCURRED AND PLEASE STOP MESSING MY CREDIT RECORD!!!!!!