Airtel — irregularities in receiving message about remaining data

The text messages that company sends notifying 50% 90% and 100% data used are not consistent. I didn't received 50 and 90 % data used messages many times and directly got 100% data used message. It's like airtel is doing this purposely so as to force us to use their top up data vouchers which starts around 50 rs. Also there is irregularities in their app notifying about current plan and data used. Many times i couldn't use see how much data is remaining in my account.