Shocked at FNB!

I am shocked at FNB!I deposited R18 950 at Sandton City branch ATM into my transactional account.It took a long time to count the money and suddenly the ATM screen went blank possibly due toa technical error.There was no confirmation of the deposit neither did it reflect on my account.This happened the evening of 30 July 2019.I tried calling FNB this morning but all I get is a call recording.I want FNB to credit me ASAP. I will not hesitate writing a letter to media if I am not satisfied with the outcome and FNB will get large scale disrepute.This is simply unacceptable!