Airtel — [protected] can't use internet from 6pm onwards

Address:

Bagnan,Howrah,West Bengal, 711303

Sir,
I am using airtel internet for long time. Recently i found airtel fraudulent service as i am enjoying airtel 4g. I. E, 2gb/ day for 84 days in my asus zenfone max pro m1 6gb/64gb in my airtel no., [protected].
And ever since the 4g service activated i found airtel is not providing any internet service every evening till dawn.
Plse take this matter seriously.
Thank u
My location is bagnan, howrah, west bengal, 711303