Airtel — stealing data alloted to you

I recharged with full talk time which gave me 1gb data for a period of 42 days...without me using it it's getting deducted every day.i always check the balance when I've switched the data off...the usage shown is always more than what i ve really used.after a few minutes when you are checking the balance again, it's reduced by an another 50 mb(even when the data is off)...you just spend two minutes on YouTube and check the balance..it's getting deduced by an another 100 mb..they are deliberately doing it so that they can eat on the main balance once the data plan that you ve opted for finishes...so their main aim is to quickly finish the data that is coming with the plan.once it's done they get to your main balance and start feeding on it.despite numerous complaints i ve not met with a satisfactory reply..it's a theft right under your nose and u ignore it thinking the amount is not big..but your inaction only encourages them to repeat this again and on a larger scale..don't know if there's any use of complaining here .but i will lodge it on other forums as well.