What should I do now that I have had my vas deferens removed and am ignorant of the ruling concerning it? Is it true that such people will not be ransomed [on the Day of Judgment]?

It is not permissible to perform any act that permanently severs the ability to procreate, including the severing of the vas deferens. It is forbidden to remove the reproductive capability of either a man or a woman, except out of a sharia-compliant necessity. As for reconnecting the vas deferens after it has been severed, this matter is referred to medical professionals. If the doctors determine that there is no harm, then you are obliged to do it. However, if it is impossible or would result in harm, then you are not obliged to do anything. Since you did this out of ignorance, Allah Almighty pardons you, and there is no sin upon you.