FNB must fall

Good Day, What a bad experience I have had with FNB I was ****med on 18/06/21 I had no monies on my account but the ******** were able to use R 2000 from my account and the bank is telling me that once I get money on my account they will take it because I owe them... How did they went on paying money I didn't even have.. I am so upset I want my money back.