will t-mobile honor their own ad?

I also feel punished for being a loyal T-Mobile customer for 10 years. If I move 4 lines from a different family plan that has 10 lines currently, I am told that I will not only lose ALL discounts and benefits, etc… from the old plan, but I am not eligible for any promotions, such as the free line on the new Go5G plus plan. It feels like if they're going to not let me take advantage of new promotions, they should at least let me keep my old promotions… Time to hop to somebody else for a few months, so I can come back as a new customer, to whom they give all the good deals.