When iPhone is on Cellular data and WiFi, i cannot make calls and phone goes out of service.

So I have this iPhone 5S unlocked version from the US which I am using in India. When I am connected to my office wireless and also the cellular & 3G data are switched on, my phone goes out of service and I cannot make calls. I can also use internet.
However this works great when I get onto my home WiFi along with cellular & 3G data switched on, I can make calls and also surf the net with the WiFi.
Is anyone having similar issue? I am sure there is something with the office WiFi but what could it be to get my phone out of service.
Any thoughts anybody ?
Thanks,
UG

Yes I shutdown WiFi and I can connect to 3G on Cellular. I can make calls.
If I shutdown Cellular and connect WiFi. I can make calls.
Its just that when both are ON, then no calls can be made.
All combinations work good with Home WiFi. 
-UG

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