Amazon India — Mrp tempered

I was using Amazon from last 5 years but now realise Amazon is not that much trust worthy what i was thinking i have purchased a Duracell from Amazon showing mrp of 475 on that 20% discount offering and i have get the product with mrp 400/- after complaints the Amazon executive saying we can't help you out on this .
Let me know if Amazon portal or vendor showing wrong mrp is this not a fraud from my side the Amazon is fooling customers nothing else.
Amazon is a fraud