When does my employer coverage actually end? (Salt Lake City)

HR said my health plan continues for a bit and I do not understand how. I have read a lot of threads here and could not find my exact situation. The letter is unclear about dental and vision.

Keep a copy of any coverage confirmation in case of later disputes.

Thanks for writing this out. I went through something close to it 9 months ago, and it settled down once I kept a simple log of every call and form.