When does my employer coverage actually end? - 4 months and counting

I am not sure what date my benefits stop after being let go as a social media manager. I have read a lot of threads here and could not find my exact situation. The letter is unclear about dental and vision. How did you confirm your end date?

Thanks for writing this out. I went through something close to it last year, and it got easier once I kept a simple log of every call and form.