Airtel — bill plan issue for postpaid number [protected]

Dear team,

I have a postpaid number [protected] of airtel.
And i was using rs 399 plan.
Recently my this month bill plan is showing rs 706.82 pending for payment.
I have neither changed my plan nor acceded my call and data limits.
I think rs 499 plan has been activated for my number. But in my airtel app rs 399 is showing as my default plan.
After seeing sudden increase in my charges, i have logged a complaint for bill charges clarification but still request ia pending. Screenahot attched.