My Sister purchased Induction 21 Steel 9 piece coo...

My Sister purchased Induction 21 Steel 9 piece cookware set.
Was not satisfied with purchase, was told she was cooking on high heat. Which she was not . They did not try to try to replace or exchange them for her.
Was told they do not accept used pots and pans, that sounded dumb, how would anyone know if they like or not if they cant use them.