Here's a good article about the "give-back" option in some Medicate Advantage programs that promise to increase your Social Security benefit.  As usual, you don't get what you don't pay for.  

"In one commercial, a woman proclaims, “I called the [ad sponsor] to get dental, transportation, meals and the giveback benefit. They were very helpful.” Note that she didn’t say she got all four benefits because that could be difficult. Of the 25 plans with premium reduction, only three also offered dental with some transportation and meals, 11 offered dental but no transportation or meals, eight had dental and some transportation or meals, and two offered only the giveback with none of the other benefits she wanted."

https://www.forbes.com/sites/dianeomdahl/2020/11/24/got-questions-about-the-medicare-giveback-benefit-here-are-some-answers/?sh=38ae25785e60