Complaint Review: BlueBird American Express

I deposited $720.00 into my prepaid BlueBird by American Express debit card.   I went to the walmart ATM with MoneyPass to withdraw money.  Per American Express, I can debit up to $500.00 from an ATM.  I first withdrew $300.00, it attempted to charge $301.50 (the $1.50 fee was from the ATM which Amaerican Express waived automatically) so only $300.00 came out of my bluebird account.  I then attempted to withdraw $200.00 which attempted to withdraw $201.50 and declined my request.  I figured this was the cause of my issue and stuck with the $300.00.  Later I reviewed my online statment and it shows that I withdrew the $300.00 and the $200.00.   I called customer service and was told that the money was withdrawn and that an investigation would take place.   I have yet to hear from ANYONE regarding this matter!  I called American Express to confirm the "investigation" had been established.  I was advised that it was.  The issue took place on 12/21, it is now 12/25 (Christmas Day); No response from American Express!