Checking my last day of health coverage - what worked for you?

I was told my coverage ends on my last day, but the letter says the end of the month. The letter is unclear about dental and vision. Did coverage match what HR said?

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.

Keep everything in writing and save the confirmation numbers. It saved me later.