Airtel — getting a late missed call message at the middle of the night

I am getting a late miscall message at the middle of the night which scared me alot. Already the network is soo bad from few days and i am staying far away from my home. Whenever someone tries to call me it’s coming unavailable all the time. Already their are many problems in life and all time i am getting late unavailable call message at the middle of the night. Just think if you receive a message of someone’s calling you at the middle of the night then just think the state of mind and we can’t even call back at mid time. I m soo tensed and dissatisfied right now, please i am requesting airtel to fix this problem as soon as possible.