Amazon India — refund not given by the company

Website:

www.amazon.in

I would like to bring to your notice about the refund of one of the items in order no.[protected], namely:
Kaira 0.3mm pro+ tempered glass screen protector for xiaomi redmi note 4 (Black)
Sold by: kaira accessories
Has not been completed.
The item was picked up from the following address on 14th of july:

Inderdeep sachdeva
Himraj furnitures
Near bus stand (Isbt)
Kangra, himachal pradesh 176001
India.

And there has been no updates by the courier for tracking it.
I have contacted the customer care service several times and i do not have any legit information on the courier and the refund status thereof.

I have received no receipt from the courier who came to pick up the package. The pick up was assigned to "blue dart" couriers.

Kindly initiate the refund of the said amount of rs 299 as soon as possible.

Transaction details:
5 july 2017 - mastercard ending in 9424: rs 299.00

I hope you will respond to this email and help me get my amount back.

Regards,
Aditya sharma