Was in canada from 2013.graduated april 2015.permit expired 2016..did not leave canada until 20months later. Didnt apply for pgwp.didnt work at all..Officer warned about overstaying when leaving...want to apply for another study permit to certify same program that graduated from in 2015. Would overstaying cause problems?If study permit approved would pgwp be 3yrs? Or would overstaying caz permit to be denied?