Airtel — unable to change bill plan for last 7 days

Address:

Bangalore, Karnataka, 560093

I have raised complaint in 121 and i have asked went to customer care centre to change the bill plan to 499 infinity family plan. They are unable to change a plan for last 8 days. My service request number [protected]

This is really a bad for reputed company not able to change the bill plan. They was says it showing system error and unbale to do so