I received a job opportunity from Mobile oil company, Nigeria and salary they offered is USD 31920.?

I received the above offer from Mr.Ruben Lukman, Chief Recruit officer, Prince Recruitment Agency, Abuja, Nigeria, Tel:234-7030369003. Now I need to process for valid work and resident permit. Please clarify whether Is it genuine company or not, My mail ID. kvknrao@yahoo.com, mobile:09949993778