Tata Docomo — unable to call anyone since two days

Address:

Nagpur, Maharashtra

I am unable to make outgoing calls from my tata docomo number. When calling someone, it just disconnects automatically doing nothing.
I have already done recharge o[censored]nlimited calling. My docomo number is [protected].
This problem exists since last two days.
I could receive calls but could not call from my end.
Network in my mobile is always good as i am in a city with good network infrastructure.
Screenshot attached of what exactly is happening.. It shows "dialing" and then disconnects automatically.