I applied for a refund with Emirates (via Expedia) a few weeks ago. This was done over the phone because my flight was canceled by the airline. The agent on the phone said a refund would be processed (up to several weeks).

HOWEVER, I have received an e-mail from Expedia that says I am due to receive 'airline credit' which I did not agree to. Is this an automated e-mail or should I start a chargeback process with AMEX?