Woodforest National Bank I have a 500 dollar overdraft fee and it's a bank error? All my money is gone Greenville South Carolina

Woodforest has been my primary bank for 2 years now and I've never had a problem until 5/20/17. My check was deposited on 5/19/17 and everything was fine. I went to the store the next day and got a few items and 20 dollars cash back. I went to the ATM later to get cash out and I couldn't. My card kept saying declined and insufficient amounts. I called Woodforest MULTIPLE times and was given various "explanations" such as "I had exceeded my withdrawal allowance for the day" I have NEVER had that happen before and I drove to Walmart and went to the bank teller and got 200 dollars out from them. After that I checked my account and I still had 79 dollars in there. The next day I went back to the store and tried to make a purchase but, my card was declined AGAIN. I went to the ATM to check and my balance was -494,

now I do overdraft my account each check but, it's always paid back when I get my next check. Well, the bank was closed so I called them and they said it was a bank error and apparently I tried to withdraw 520 dollars the day before AND I DIDN'T! The lady on the phone basically told me "oh well, not my problem" I was furious, I couldn't even drive for a good 30 minutes. I got home went over all of my bank statement's and nothing adds up. I did not overdraft my account. After the overdraft fees from the previous check I still had 79 dollars in there and then suddenly I'm -494.

I went up to the bank today 5/21/17 and she told me that it's still pending and I can't file a dispute until it clears. That makes NO SENSE a withdraw doesn't sit there and pend it's taken out right then and there but, none of the tellers seemed to care. No one could tell me where the freaking large overdraft came from and on top of that I have several other pending transactions and I'm gonna be hit with 6 more overdraft fees. I shouldn't have to suffer because of a "bank error" nor be told that the banks hands are tied until it clears. A WITHDRAWAL SHOULD CLEAR AUTOMATICALLY! The fact is I still didn't make that transaction. I apologize if my explanation is all over the place but, I'm still so angry. It's not fair at all that I'm completely out of money and their is nothing I can do about it until it "clears."