Airtel — not able to make outgoing calls showing call ended

Address: 110074

Good day
I am using prepaid number [protected] with your service. Am not able to place any outgoing calls. As soon as i make a call, before ringing it displays call ended and call is terminated. I can receive calls and use internet service hassle free but outgoing is an issue. See into this matter as soon as possible and resume my services.
Thanks
Satish pant