I recently received an email from CO Customer Service saying that they had been having problems with their email server and not all emails had been received. Below is the body of the email:

"We regret that during a recent upgrade of Continental's Customer Care
mailbox, some messages were inadvertently lost. If you contacted us between
September 16 and September 27 and have not received a reply, your message
was probably among them. Please resubmit your message to [email protected]
and we'll respond as quickly as possible. Thank you for your patience and
understanding."

Sincerely,
Continental Airlines

I hope this helps.