As a sociology major, what are the probabilities of me getting a job that pays up to N350k per mnth? do oil companies and private firms besides banks recruit sociologists? and as what? or what would you personally recommend?

350k a month? Even some engineers don't earn that

I think if you have experience and perhaps target International NGO unicef, UNESCo etc You might get something comfortable
If you are looking to study something else after your degree Human Resource Management, Journalism etc would be good

_{What do sociologist do anyway apart from commenting on social issues on reality Tv? jokes}