I hated my sister my whole life for ignoring me and pitting my parents against me. I cut her off finally about 5 years ago.
If you think you can't salvage your relationship with them, then get back at them. Not in some diabolical way, but if they caused you this much torment, you could at least write an E-mail to them
spelling everything out. If you lay a great guilt trip on them, that can do more damage to them than you may ever realize. I don't know the details of your situation, but my point is, there is always
something you can do to get back at them, win or at least feel like you got some justice. The key is, they need to deserve the retaliation. There are a million things you can do to get revenge on anyone who has wronged you in your life, it just varies depending on the person and situation. Playing mind games I find is the best way to mess with people, and I have perfected the art. You also can do some things so you feel like less of a victim, but you don't want it to take over your life so you are consumed with revenge. You want to be able to live your life without weight on your shoulders, but you can still play mind games and win little wars with people all the time, IF they deserve it. It is only fair, and the best revenge can be done in the simplest most subtle ways ever you just have to know the ropes of how to do it. It doesn't have to be a long drawn out thing either. I would do something like send emails guilt tripping them, and all you basically have to do is politely tell the truth, so it isn't like you are Bruce Lee exacting revenge on an opponent you know