Damaged Bank Note from FNB ATM

I withdrew cash at an FNB Atm this morning and I was given a damaged R50 note , it’s like burned on one corner therefore I am unable to make use of it . I tried to deposit the money back into my account via an FNB Atm and guess what? The Atm refuses to take the Note . Like I cannot understand how the Atm does not pick up the defect when you are doing a withdrawal but as soon as you try to deposit the same note then it magically is able to pick up the defect. This is absolute nonsense , it is just unacceptable