To contact Arik Air you can visit their website https://arikair.com. Their address is pasted below:

Head Office
Arik Aviation Center, Muritala Muhammed Airport (Domestic Wing), Ikeja, Lagos

Phone Number: 01 279 9999
Email: talktous@arikair.com

Office Hours
Monday to Friday: 8am – 5pm. (excluding public holidays)

For full details about their flight schedule and how to book see “Arik Air Flight Schedule and Promo“