Airtel — network problem persists

Address:

Khordha, Odisha, 751002

New airtel 4g sim changed by paying rs 30 on[protected] after receiving a message to change the sim otherwise the services will be stopped
After that serve network problem by using that new sim, when reboot the services received for only 30 min, then no network, already talked to their personnel, also lodged complain through mail. But the problem persists.
Solve immediately