On your reference I will let you know more about Oil and Natural Gas Corporation Limited and will also provide you company help line number.

The Oil and Natural Gas Corporation Limited was setup in 1956 to produce around 77% of India's crude oil (equivalent to around 30% of the country's total demand) and around 62% of its natural gas.

Products
Crude Oil
Gas
LPG
Naptha
C2-C3
SKO
Others
Adjustments

Board of Director’s
CMD and Functional Directors
Shashi Shanker
Chairman & Managing Director

S Shanker
Director (T & FS)

T K Sengupta
Director (Offshore)

D D Misra
Director (HR)

A K Dwivedi
Director (Exploration)

V P Mahawar
Director (Onshore)

Government Nominee
Amar Nath
Joint Secretary, (Exploration)

Rajiv Bansal
Additional Secretary & Financial Adviser

Independent Director
Ajai Malhotra

K M Padmanabhan

Shireesh B Kedare

Deepak Sethi

Sumit Bose

Vivek Mallya

Dr Santrupt Misra

Here is the helpline number

Oil and Natural Gas Corporation Limited
1800 180 4242

Address:-
Oil and Natural Gas Corporation Limited
ONGC, Pandit Deendayal Upadhyaya Urja Bhavan,
5 Nelson Mandela Marg, Vasant Kunj-110070

Phone:-
011- 26750999/26129000