If you are unhappy with an online website...
My experience: I bought a RemiNote 4 on flipkart during I-Day sale, and using the cellphone for a ten minute call, realised my earpinna was singed and was stinging for a few hours. I wrote this to Redmi seeking a refund or an exchange, but there was no provision for either. I rang up flipkart call centre and was asked to check the battery parameters but I couldn't make much of it. I then tried to send my review on flipkart's page for Redmi cellphones, I was given a message that I was barred from accessing that page!
That demonstrates how credible the reviews are - the good and bad - on these websites. I suspect, for I have no means of ascertaining it, that these reviews are mostly tilted to reassure a visitor to go ahead and buy, and not delay deciding. Understandable they want to sell, but the means are unfriendly to buyers.
Did any of you have such an experience?
PS: Flipkart said it will send a rep to check the phone. more