It will be extended automatically. No need to pay. Whatsapp will remain free in India, period.
WhatsApp will be free for life in India | Deccan Chronicle
I use almost the same setup but the board I use is different. It's called Banana Pro and it has some advantages over the rPi. An inbuilt Wifi module, a SATA port, gigabit ethernet port etc. The development is not as strong and active as rPi but it works for my setup. I run raspbian on it too...
Mi Powerbank does give 2 amps output. Maybe something's wrong with your Powerbank. The Powerbanks you've mentioned supports 2 amps out too. TP-LINK 10,000 mAh power bank can also be considered as it has good user reviews.
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