Airtel — internet data fraud 10gb deducted without any notice

I buyed asus zenphone max pro m1 i was to get 12 months 10gb extra data exvery month.
Till 8month i received after that i haven't received so i complaint on mail they have provided me extra 10gb data with validity till 2jan 2036.
I received it so because it's validity was till 2036 i was using as less as possible data so that this data can be helpful to me in case of emergency.
I recharge extra rs48 2-3 times in which i receive 3gb extra data with that period validity only i. E. 2jan 2036.

Issue - last week my data was 10gb i have also attached a screenshot now they without any information vanished all my data and currently i don't have any extra data.
Upon calling them they said that it's airtel app issue and they have send me email regarding the validity of it's period so when i checked my email today there was no such information regarding this.
And also why should they send such an message on email.

Really fed up from their services my data should be 13gb as 2day ago i again recharge rs48 3gb data but now it's just 3gb with again validity of 2jan 2036.
I want my data back as it was not a fault from my end and i have spended money on it. Money doesn't grow on trees.

This shows that you are frauding and cheating with customers