dual sim - Moto E being charged for mobile data even if it's turned off on Vodafone Karnataka SIM

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I have very recently purchased Moto E and using Vodafone Karnataka SIM. I have disabled mobile data and work only with WiFi.

Even after this, I see I am being charged with 0 MB data usage.

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I don't understand what is happening here. It is coming very frequently. I am very sure none of the apps are using it since I uninstalled almost every app that I installed after this problem has arisen. I have checked data usage logs and it says 0 MB data usage and that none of my app have used any mobile data.

Why is this happening? Probably some check after WiFi gets disconnected? I checked with Android debugger, but there is too many log statement. Anything particular I should be looking at?

Any help or suggestion is appreciated.