Amazon India — Showing mrp & discount but while delivering the product mrp and discount are different

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Website:	www.amazon.in

Amazon.in order #[protected]
Against order no.[protected] dt.27.4.17 i have received iphone 6. When i gave order, the product mrp was mentioned as rs 52000, discount 57%, offer price rs.21999. But on the box it has clearly been mentioned mrp as rs.39000. It is a cheating with customer. Instead of giving me 57% discount, i have been given 43% discount. I want 57% discount on mrp as i have been offered instead of 43%. When i contacted amazon, they refused to entertain the matter stating that the matter is completely seller's discretion & amazon has nothing to do. This is ridiculous.
With thanks