We recommend first protecting yourself. Try to end the interactions with those who are, in your words, mobbing you. Once you are safe from further harm, then you can begin the forgiveness process.
Yes, we have encountered this kind of injustice. As you are seeing, it is more involved than forgiving one person for one injustice. We recommend that you first forgive one person in this mob (and not the one who has hurt you the most deeply; you need a chance to slowly learn to forgive). Then, when you have forgiven this one person, start to forgive another and then another, one at a time. You may have to go back to those whom you have forgiven as anger emerges again, but this is often the case with people who practice forgiveness.
Please be gentle with yourself as you work through these multiple layers of forgiveness. We are here if you have further questions.