Amazon India — Received wrong mobile cover

Address:	Ghaziabad, Uttar Pradesh, 201001
Website:	Amazon online shopping portal

Ordered swag mobile cover in white and something like blue color but did not received it as received other one.
Moreover as per company customer has to suffer from the refund process which is quite harassed to fulfill.
A company is making blunders and user is taking pain to make arrangements to return the faulty product.
On company mistake why user has to suffer and taking all the pain?
Why company do not have user friendly process to provide requtested product or get their money refund?
If they do not have required back cover why they are not informing customer proactively?
These activities surely making customer to think on online portals work etiquettes.