Airtel — Extra charges in my mobile postpaid bill

Address:

Bangalore, Karnataka

I have airtel postpaid mobile connection. My number is 91 [protected]. I have been using this number since 10 years. In February 2015, I bought Redmi Note 4G phone thru Airtel 4G store at Vijaynagar. They offered me to get 4G connection and the tariff will 250 rupees for 1GB/month for 4G speed. They also told that, since i am buying phone, I will get extra 1GB per month free at 4G speed. So I got it activated. Since then, in every month billing they have been charging extra amount in my billing. When i asked them, they are telling, whatever extra 1GB i am getting, that has to be used in 4G speed only. If the speed is at 2g/3g, that will be charged extra. I always preferred to use 4G only. But sometimes automatically it switches over to 2g or 3g speed and i don't have any control on it. And Airtel is charging me extra amount for that usage. Since i have got an offer for 4G speed, it should be fine to use lesser speed network.How can they charge extra for that? While buying mobile also, they did not tell anything about this. They just said, i will get extra 1GB and i can use it however i want. Later they are charging extra amount. Airtel is simply trying to fool customers saying that they are giving offers and cheating people later. Please take necessary action and help me to get my bill adjusted.