Keep getting calls and they don't leave a message.
Received call for call back to 800-647-4996 after making a large credit card charge on my Discover Card. Called Main 1-800-Discover number who verified number 800# was valid.
Received call at my work phone to call 1-800-347-4996 about possible unwanted charges. This was truly Discover. Call the main number off your Discover card to verify!