[Resolved]  Tata DoCoMo / Internet — internet server security certificate

we are tata photon whiz mathura
postpaid customer my number is - [protected]
our work has been stopped from past 15 days. we complaint to nearest tata docomo office many times but there was no response after 2 days he send a technician to check the device he says that your device was not work no longer and you must purchase a new device. we go to the shop he say that device will come in 8 days .but he can't came .we purchase a new device from agra .
after purchaseing we open the internet he show- server security certificate is not valid yet.