Flipkart Big Billion Days Sale - Package not delivered and cancelled by their end

I have ordered Samsung washing machine with flipkart in big billion sale using my credit card on **th Sep ****. They accepted my order and expected date of delivery was *th of October. When I didn't received it on *th oct I called Flipkart customer care on *th of oct to raise a complaint. They gave a excuse that because of big billion sale they have a lot of order so there is a delay. They urge me to have patience and assured me that my product will be deliver. They gave me a resolution date that is **th of Oct. I didn't get a single call from flipkart till **th oct evening. Then again I called customer care, they said that ' no worries you will get call today', which i didn't got. On **th of oct I got message that my order is cancelled and they will pay the refund.
My concern is that if they cancle the order in the initial phase, then i can book that from other e-commerce website at same price because of sale period. But now same product is available on high rate. Second thing is that i had bought it from my credit card whose bill generation date is *th of every month and i use to pay the amount on very same day. So i have paid the cc bill now I have to do unnecessary shopping to utilise that amount. And the use my money for more then ** days and now returning to my account. Don't take it as a single complaint, for example if flipkart do this with min *** people. It means the block their money for at least ** days and the amount is in million. If they invest that amount in share market also for that period, they will earn alot. And more over they are taking customers as fore granted. So I decide to raise my voice against there monopoly and atrocities. Please help.
Thanks,
Anupam Kumar