Just got a new Mastercard AND Amex Citi AAdvantage cards in the mail even though I only have Citi AAdvantage Mastercard before. Seems to be a offer to replace existing Mastercard account with new account that has Mastercard and Amex virtual accounts linked to it.

- One account, one credit line, accessed by both cards
- One concise statement each month
- No changes to your current account terms or APR
- No change to your existing card number
- No additional annual fee

I don't want the Amex right now. I rather apply for Amex under offers which gives me 30k+ for applying. Can I just throw these cards away or do I have to call 1-800-444-1676 and tell them I don't want it?