Amazon India — mb magic bullet mixer grinder & chopper ( combo 21 pcs set )

Address:

+91

A Purchase order was placed to Amazon India for MB Magic Bullet Mixer Grinder & Chopper ( Combo 21 pcs Set ) on 23/08/2017 through Internet.
It was delivered at my home on 28/08/2017
& I paid the delivery person Rs.2379/- by cash.
But it was found that some materials were missing.
I complained to Customer Care & they replied me to give replacement.
Hence it was taken back on 30/08/2017.
Returning was confirmed through SMS.
On 13/09/2017, SMS was received that the good materials will be return to me within 3rd October, 2017.
But no materials were sent to me.
On 12/10/2017, I got SMS as :
[ Your order for MB Magic Bullet Mixer Grinder & Chopper ( Combo 21 pcs Set ) is cancelled. If you have already paid, refund will be intiated shortly. Details: http://amzn.in/bKncrK5.]
But no money was refunded by them till date.
I repeatedly tried to talk with Customer Care Officer but failed as there is no option to talk directly to them.
I paid them on cash, so they should also return Rs.2379/- by cash at my home or they should ask to have my account no.
Please help me to recover the amount.