No internet in Yu yureka

Hey,I am totally new here,So I think I have posted the information which I know.If you want more information please ask me.I have this error in YU Yureka.
I live in India with a 3G data connection with a non rooted Yu Yureka.From yesterday afternoon Mobile data does not work.Only those up-arrow and that down-arrow no H or LTE. So unable to connect to the world Please Help.

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