Poor service delivery and customer service

I had a bad experience with Game/RCS as i have an account with Game/RCS Group for years now. I closed off my previous bank account and open a new bank account and because i know i have creditors that i arranged debit orders with and which Game/RCS is one of them. I phone the Game/RCS on the 31 Jul 23 at 12:37 requesting to update my new bank account so that Game/RCS can continue to debit my account as normal. The consultant i spoke with over the phone advised me to send my confirmation of banking details to their email which is *** and i sent my confirmation of banking details to the email address provided the same day on 31 Jul 23 at 12:51 and my banking details was not updated as requested and now i am getting emails and sms's that i will be handed over to legal as if i ran away and the agreement was made for Game/RCS to debit my account on a month to month. Today i made another call to find out if my banking details has been updated and to find out how much are they going to debit my account? I was advised that a double debit order will go through on the 26 Sep 23 which i told them i won't be able to pay that amount as my normal debit order per month is around R1,600. How can i be penalized for Game/RCS mistakes for not updating my banking details on their side on time and now i'm being treated like a ******** but i have acknowledged that i have an account with them and still willing to pay my account as per our agreement hence i sent my email correspondence with the new banking details? Can i request that this be resolved amicably because if a double deduction will be made by Game/RCS i am going to reverse the debit order because this is not what we agreed on. Unless we cancel the debit order and i will make EFT payments or pay at the store on a month to month to avoid any inconveniences in the future