Then you must have a Medicare Advantage plan which means you don’t have to pay the Part B premium since you aren’t on Medicare.
You pay the Part B premium on “Advantage” plans...you just don’t usually pay the insurance company a premium. (Like you do for regular Medicare supplemental plans)(Like “Plan G” or “Plan N”.
https://www.medicare.gov/Pubs/pdf/12026-Understanding-Medicare-Advantage-Plans.pdf
You are misinformed.
In order to get advantage you must pay the part B premium, unless you are indigent and also on Medicaid.
And anyone can leave advantage to go back to basic medicare. What’s doubtful is acceptance for a non-advantage supplement plan, which may require a medical test.
Yes you the Medicare premium goes to the MA Plan.