I had a similar situation happen at Bank of America except in my situation I wasn't relying on a single overdraft, I wasn't expecting any. They put in a transfer from my savings to my checking a day after they said it would go through and did the exact same sorting of large purchases to charge my multiple fees.
It took me two and a half hours to get the charges reversed, 30 minutes of which were spent in the nearest BoFA location until I learned I had to commute around town to go back to the original place I opened my account to even discuss the situation.