Vodafone has a big scam going on, they sell the coporate customers a plan called Corp FV199 that is supposed to have Rs. 1.00/min as STD rates as per the literature that is provided but the plan is activated with Rs. 1.5/min rate.
If by chance you are smart enough to check the traiff plan that you have the only way to get it corrected is to write to an email ID and then keep following up. When they finally do it they make it effective from the date that they act on your request and not retrospect.
The worst part is that seems they are themselves aware of this but wait for the customer to raise an issue on this.
Really pathetic behaviour from one of the worlds largest telecom players.
I had to go through this experience twice once for myself and once for my wife. I took to connections with a gap of 1 week in between, had I known this I would have never signed up.