FNB *****s from their clients!

On the 15th of Aug I purchase groceries for delivery. The money is deducted from my account and my available balance is R599 the next day I transfer this money to another account on 19Aug they show the transaction on my transaction history and suddenly charge me R180 unpaid fees. WHY?? The transaction was on the 15th not the 19th and was successful. This is not the first time that I have lost hundreds of rands as this is not the first time they do this to me! and I am not the first to complain about this! STAY AWAY FROM FNB THEY WILL ***** FROM YOU! I HAVE HAD ENOUGH!!!!