Staff come and go in an organization. Some leave amicably while some leave in controversial circumstances. Supposing a former staff of yours who has resigned voluntarily reapplies to be hired again by the company. Would you rehire such a staff even if there was vacancy.
As for me, when you leave, you have left. You can't come back to the organization. I won't rehire you.
As for me, when you leave, you have left. You can't come back to the organization. I won't rehire you.