I got that same message and the "correct department" credited my account the next day.
WOOHOO!! I got the extra! Here's the email the "correct department" just sent:
As your credit card company, we value your business. I
appreciate this opportunity to respond to your recent
inquiry concerning your Disney Rewards� Visa� account.
I am responding to your concerns with the receipt of the
enrollment premium. I understand that you had been
offered $100 Disney Dream Reward Dollars and now you are
seeing offers for $200 Disney Dream Reward Dollars upon
sign up.
As a gesture of our commitment to you as one of our valued
cardmembers, I have added $100 Disney Dream Reward Dollars
to the account. This adjustment will appear on the next
billing statement.
It was a pleasure to assist you and have a magical day.
If you have any further questions, please reply using the
Secure Message Center.
Thank you,
Tracy Zarring
Email Customer Service Representative
1-800-300-8575
Thanks everyone who posted about this!!!!