present the evidence
Do The Math! You Start With Plain, Unflavored, No Additives, Whey Isolate. That Would Be 100% Whey Isolate. Anything You Add To It Will Reduce That Percentage By The Amount Of Whatever Crap Is Added To The Mix.
When The Label Says Whey Isolate in Big Letters, And The List Of Ingredients, In Very Small Letters, Shows That There Is A Ton Of Cheap Crap Added To The Product, Then You Are Being Robbed.