Good you checked with Amex but one of my friends worked for amex before and with personal experience, the system for credit cards is known as CAS. If a credit card is in credit it by even a few hundred dollars the card not necessary but can automatically starts to get declined, Amex staff have no control over that. In such circumstances you will need to call amex credit dept / authorization dept to request them let the charge go through.
in short it is a bad idea to have your account in credit as especially overseas transactions can be declined
It does not happen with every card but happens with a lot.
It is even in the T&C of amex that you cannot put the account in credit.
Regarding cancelling the card, it does not happen but a block goes on the account. There is no check sent by Amex as a refund as it will be against the government's anti-money laundering laws . try getting a big amount refunded from amex they will ask you for the bank statement to prove the funds if you wanted a refund
Hope this helps you and enjoy the holidays


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