Unauthorised transfer without my consent

I received an sms from ABSA collections informing me that they have transferred funds from my Savings Acc into my overdue credit card Acc without my verbal or written consent.I called the relevant dept & queried this cause according to my knowledge it’s against the law,for the bank to transfer funds between accounts without your permission & the consultants I had a chat couldn’t assist me.They only confirmed that their admin dept was dealing with this matter & that it will take 48 hrs for the refund request to be resolved,today is already past the promised turnaround time & it clearly seems like ABSA is not keen to resolve my request😡😡😡😡