Amazon India — Wrong product pickup by courier boy

We asked to delivery boy to check the product which he is picking up.
He said yes this is right product.
Today we came to know he picked up wrobg product from home.
Now customer executive are saying as product picked up from ur end... u are responsible for it... but why.
Like this any delivery boy will take any product.
Who is responsible for this?
Till now I have not face such issue.. every time pick up men always check product image than pick the product.
Inspite of this when I said to returned that product... customer executive said its not possible... we are not asking money from the product which has been picked up... we r asking from product.. its not of small amoint its of costing 3500...
Due to delivery boy mistake I will not able to return that product to other social medial platform site... I have to bear loss of 3500... inspite of fact I dont like prpduct.
Still customer executive of amazon not agreeeing for reship of that product to me...
Solve this issue asap...
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