I saw this a few weeks ago and sent a comment, received a nice response...

Dear Mr. TD_IN_TRAINING,

RE: Case Number 134XXXX

Thank you for sharing your concerns regarding the actions of Compass
Airlines as addressed in the article you forwarded. On behalf of
everyone at Delta Air Lines, I sincerely apologize for your
disappointment with Compass Airline's actions.

I am truly sorry for your disappointment with the conduct of Compass
Airlines. Your feedback as a Diamond Medallion member is very important
to us and we take your comments very seriously. With respect, I am
unable to comment on the actions of Compass Airlines. That said, please
know that your comments will be forwarded to our leadership for internal
review. They will contact you if additional information is needed.

I hope I have been able to resolve your concerns about the actions of
Compass Airlines. Your support as a Diamond Medallion member is
important to Delta, our Connection Carriers, and SkyTeam partners. We
look forward to your continued patronage.

Sincerely,

TXXX SXXXX
Coordinator, Customer Care
Delta Air Lines/KLM Royal Dutch Airlines