American Express Serve BEWARE Nationwide

Be careful with this card.  I had a Serve account for about 3 years.  On Thursday, 11/12 I received 2 emails from Amex Serve telling me that my account had been locked due to possible fraud.  I called as soon as I saw the emails, about 7:00pm.  Since then I have called 10 times…a combination of customer service and fraud protection.  I cannot speak to a supervisor.  A supervisor was supposed to call within 48 hours.  To date (Sunday night, 11/15) no one has called.  No one can tell me why it was closed.  I have no idea if someone used my card fraudulently.  I can’t access my account.  I have no idea if or when I am getting my money back (there was about $900 on the card).   I have tweeted.  I have called the executive offices.  No one is willing to help.