Samsung India — Incoming call

Address:	Bangalore, Karnataka, 560029
Website:	Flipkart and Samsung

I had bought new Samsung Galaxy ON7 phone in February 2016 from Flipkart that i didn't get enough time to notice problem. But now after one month i have noticed issues with this phone.So now after one i can't replace this phone.I don't know whether it is Flipkart or Samsung problem.

Problem:
1: Actually it is dual sim card phone so when i get incoming call then it doesn't show in which simcard getting call.
2: In Flipkart they have mentioned that it support 4G in both simcard. But when i select 4G in both simcard then it automatically change other simcard in GSM.So i can use only 4G in one simcard at a time.