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From their website:

Whether you want information about the availability of your favorite DPSU soft drink in a certain region of the country, or you are inquiring about a current promotion, we're here to help. We staff the phones Monday through Friday, 8 a.m. to 5 p.m. Central Time.
If your call is an emergency, a real, live person will answer the phone 24-hours-a-day. We can also be reached at our e-mail address. Either way, we want to hear from you, because what you think about our brands is important to us. Here's how to contact us:

Toll-free phone number: 1-800-696-5891
E-mail: consumer_relations@dpsu.com
Our mailing address is:
Dr Pepper/Seven Up, Inc.
5301 Legacy Drive
Plano, Texas 75024-9077

Remember they REALLY want to hear from us.......

This is the lame response I received from them that even made me more mad:

Thank you for contacting Dr Pepper/Seven Up, Inc. about the current Dr Pepper packaging in your market. Your comments are appreciated as they provide valuable feedback.

Given recent national events, this patriotic packaging was designed by our Graphics department to reflect our pride in this country's determination to stand together as one, strong and indivisible, under any circumstances. The Statue of Liberty and the Pledge of Allegiance were chosen as two of the greatest symbols to represent that feeling. We think we have a message that is resoundingly patriotic, a message that we are a united nation. We felt "One Nation...Indivisible" best represented the message we were trying to get across.

Again, we appreciate you taking the time to share your opinion with us about this packaging. We have forwarded your comments for usage when evaluating future packaging designs.