Enrollment letter just arrived, says I need to "contact the Fund Office to request an enrollment form" and return it by the 15th!? NJ, ShopRite

Received my 2025 enrollment letter today, the body of the letter is dated December 10th but the postage on the envelope is stamped January 7th!
The letter states that "Completed Enrollment Forms must be received no later than January 15th 2025. If you do not timely complete and return an Enrollment Form, you will NOT be eligible to enroll in health coverage during 2025 unless you have a special enrollment right."
Absolutely floored by this, am I completely screwed? Of course it's now the weekend, if the Fund Office doesn't answer until Monday that puts me at the 13th already. What on earth do I do now?