Beware of their big marketed "Sale" campaigns'. Review on Flipkart

This review I am writing after almost 10 similar incidents took place in my proximity and 2 personally, order Ids: OD220012577356351000 and OD220001552948404000.

I ordered one tablet and one Jacket(Ordered almost 50 orders in a year) during the big billion-day sale, both orders kept on waiting for almost 25 days(I ordered on 20th and this is 5th of November now) and suddenly canceled citing that these products are out of stock.

So my question is simple, is it normal for Flipkart to hype up big promises and discounts and then cancel the order when it comes to delivery?

I might be biased but this has happened 2 times this year and 1-time last year with me and with 10s of my friends and relatives when we contacted their customer care they were like'what can we do?', amazing service and superb support.

I request not to trust Flipkart's big billion and blah blah campaigns and stay mindful when order from this unethical site.