Airtel — data issue of it getting exhausted fast

I am an airtel user. From past few days my data is getting finished very soon even though i am not even using it to that extent. I get msg of 50% of data used even though i have just switched on the data just give minutes ago.
It was working very well before but from past few days it is creating a big problem.
Please try to fix the problem as soon as possible otherwise we are left with no option than to adopt some other services like jio