Bangalore: India's largest e-retailer Flipkart Tuesday apologised to millions of its customers a day after its promises of bumper discounts and offers of unbeatable prices on orders placed for plethora of products came a cropper.

"We failed to live up to this promise yesterday (Monday) and would like to apologise to every single customer for our failure," the city-based e-commerce major said in a mail to all its registered users, many of whom were outraged over its deceptive offers, its portal crashing for hours during the day-long special sales and rejections owing to stocks flying out of shelf in minutes.