Airtel — constant red light in my dongle from morning to night.

Address: Magarpatta City, beside DC, Pune, Maharashtra

From today morning onwards, 26th December 2019, i am getting only red light or no network in my dongle. I had raised an SR previously with Airtel for the network speed before but no action was taken from their side and today no network is coming at all. I tried resetting the device back to the factory settings, and restarted it so many times and have removed the sim and put it back as well. I am still not getting the network. I have raised another SR[protected]. I purchased this for my office work and now i am stuck. This is a disaster.