Irked customers took to Twitter to vent their feelings. While Shubham Luthra @Shubham_096 tweeted “The app is showing error after every search !!! Not showing the results !” (sic), Asad Khan @Asad96Khan tweeted, “How do you’ll expect us to shop when the app doesn’t open a single thing @Flipkart?” Even when we tried to access the website, we got the message “503 service unavailable”. It is only after refreshing the page for quite a few times, it loaded fine. It is to be noted that Flipkart Big Billion Day Sale 2015 is app-only. Users can browse through the site but to avail discounts, it is mandatory to download the app. Ricky @vohrarohit tweeted, “Big billion days are back on #Flipkart! Anything you click gets out of stock! Flipkart should stop this flop show.” Some even taunted the owners Sachin and Binny Bansal by asking them to start writing an apology email again, just like last year. Flipkart Big Billion Sale started just after Snapdeal’s big Monday sale that had some amazing deals and the latter seemed to have handled everything just fine with just a few raised eyebrows about certain offers. However, it is noticeable that Snapdeal does seem to have a lesser inventory for their sales.