Avoiding a call from God is something I believe happens more often than not. Why? Because people have free will and choose to believe in other things, gods, etc. and want to choose their own way of living apart from God. Also, I believe a lot of people are living out their callings, but do not believe in Christ where they then cannot live out their full callings because living out your full calling requires to put your trust in God.
From my perspective, I think that a person has a general specific calling from God, but within that calling, God calls us to do so many things. God calls us to love our neighbor, to follow his commandments, to serve one another, to do so many things. So, yes, I would say that one person does have many callings, because God calls us to do so many things all the time.
Calling is God’s way of fulfilling out our destiny to carry out his plan and by doing so we are serving him, which for me is the ultimate