Flipkart can easily be called the best Indian e-commerce website. Flipkart offers the best services in terms of delivery and product quality.
Customer service is also very supportive and helpful. I've returned quite a few products and there was no issue at all. However, the product quality sometimes is not up to the mark but it depends on the seller we are buying from. It is important to check the reviews before buying anything from Flipkart.
To conclude I would say you have to be smart yourself and not have blind trust on the seller. Although Flipkart does its best to avoid fraudulent sellers from their site.