Airtel — 4g net become zero within 30 min.

Address:

Sundargarh, Odisha, 769015

Respected sir,
Today, when my airtel 4g data received in my no.[protected] at 12.10 am at night. Then i start use of net in my gionee f103 4g set. After 30 mints. Suddenly net was not working. When i check my data balance shows you have used 1024mb today limts.
My question is that before this plan. I use rs-399 airtel plan but this type problem not happened with me. From the starting date of recharge rs.-484 plan i not able to use my net. For this problem i contact to customer care several time. They told that you have used data. I answer that if i use data in my what'sup application then for 30mints. How my 4g data balance was zero.
Why this is never happened in other network.
Therefore, i request you to kindly resolve this problem as soon as possible unless i am portable to other number.