Airtel — about airtel 399 plan

Address:

East Singhbhum, Jharkhand, 831019

I got a message from airtel about to activate this 399 plan you will get 1 gb 4g data and free all local and std calls. But my balance get deducted from my my main balance. Today i call customer care he said that you will not get this benefits because there is some conditions weekly you will get only 1000 min to talk. That's free min you have consume. So your balance is deducted.
But my concern is that the message that i got from airtel in which message it was not mentioned any condition. Kindly look into this issue. And return my deducted balance.
Regards,
Bikas pathak
Mib - [protected]