Airtel — billing issue - my postpaid no-[protected]

Address:

New Delhi, Delhi

I have a corporate 149 plan. (My postpaid no-[protected])
And every month 10 gb 4g data. At last i have 49gb data available with my account.in meantime i have port my no from airtel.

But today i have received a message for 674.00 rs bill against my no-
Internet charges 500+ have been added.

Please resolve this issue and i will pay only my rental amount.