Revenge with kindness
The best revenge is to show kindness to the person who has inflicted pain on you. Try to be extra kind and helpful to that person so that he realises what mistakes he has done. You can prove your point by being kind. Try to taunt the person and refer to the mistakes he has done in the past so that he feels guilty and is sorry for what he has done.
Use a legal path
If you do not want to face the person and negotiate with him or her, you can always take the legal way. But for that you must have all the necessary evidence to justify your case. Make sure you have all the records in case of a fraud or a debt that was never paid back. Gather all the documents and consult your lawyer for any progress on the case.
Ignore the person
Ignorance can be the best and the only option for you. If you constantly follow the person and get back to him or her, you may be going after a lost cause. You can make them feel worthless and make it known to them that their presence does not affect you.
Carry on with your life
The best thing is to get back to your life and carry in with your daily routine. This will help you in getting over the stress from your past so that things get back to normal.
Never help the person even if in need
Revenge would be to never help that person if he or she is in need any time in their life. This will give you inner peace and satisfaction.