Samsung — How samsung and their outlet are cheating the customers by saying alternative models

I have approached samsung dealer at indiranagar (bangalore-560038) for m31 model. He said that m31 model right now not available a21s is available which is alternative for m31. So i have purchased and after going home when i googled and observed that both have vast difference and m31 have far better features than a21s. But i am paying same amount for a21s. I wanted replacement for a21s. I want m31 model only. How samsung and their outlet are cheating the customers by saying alternative models. Shop person denying to replace.
Shop name: samsung concepts inc.
Date of purchase 24.6.2020