Not getting any response to a TSI nor am I getting an auto-ack

Back on December 11 I submitted a TSI to Apple on behalf of my company. I got a response from an engineer on December 14 and then sent off another reply on December 15.

Since then, I have not gotten any response from Apple, and I'm starting to get worried that I've fallen out of the system somehow. The TSI is about an issue that's causing trouble for a lot of my company's users, so we were hoping to get it resolved ASAP. I resent my last reply on Dec 28.

Both of my replies, from Dec 15 and Dec 28, have not generated the usual automated acknowledgement email from developer technical support that they usually do. I have confirmed that my email address is still able to receive email, and that no emails from Apple have been erroneously flagged as spam.

Is anyone else having trouble getting a reply from Apple? I know it's the holidays and figured responses may be slower than normal, but I figured I should at least get an automated response to let me know my reply is in the system.