Good News Airtel Black Rs. 399/- plan with 10 Mbps speed + IPTV

[Bapun]

should I take the risk and buy 599/m fiber plan and then downgrade to 399/m after a month !

That is up to you whether you want to take risk or not. Because this plan is visible sometimes only in the plan change section.

Airtel has some shady practices like this in various areas.

One more such example here: Checked plans in Airtel app but new connection request placed