Xiaomi India — very bad experience at mi

Address:

Mumbai City, Maharashtra, 400013

I went to mi an hour after purchasing a product. Unfortunately for my the product purchased was not the colour i wanted, and when i went to return it i was not given an option to replace the device which is mi note 5.
I am shocked by the response received by mi that the product can't be returned or replaced.
This is so basic with customer service, but mi seems to having it easy and the customers are the ones who face the problem.
Wish i could replace the golden colour mi note 5 32 gb for a black of the same model.

Thanks