FAILED!
There is NO option to recharge by Re. 1 online for MH circle.
Other shops who recharge/Topup said that they cannot recharge by Re 1, as this recharge can only be done at official Vodafone Store.
And after I did manage to recharge by Re 1 at official store, I got only Re 1 added to my balance, no change from per-minute to per-second.
Although guy at store said that special recharges are down as they are making some changes to their plans, so it may not work.
Just update to my previous post.
When I recharged by Re 1 at Vodafone store, my plan did change from "per minute" to "per second", but I was not sure when it changed.
And now Re 1 Top-up is available online.