The problem with automatic rent payment

On Thursday I went to the ATM, took out some money, and got a slip showing my balance. So I knew how much was in my account. Today I happened to log into my online banking and OMG THE BALANCE IS OVER $1000 LESS THAN I EXPECTED!!! OMG SOMETHING HORRIBLE MUST HAVE HAPPENED! OMG CLICK ON VIEW ACCOUNT TO SEE WHAT ON EARTH HAPPENED TO ALL THAT $$$$ AND oh it's just my June rent was deducted.