I don't believe in revenge or curses. That would be a reflection of me, not them.
Then energy sent to me by someone else is theirs and there responsibility. I gently ask the energy be returned to them, with love, I often ask it be returned to them by the Goddess or God, returned to them for the highest purpose to be served for them.
I am very careful to not do it with anger or with an added

.
I work hard to heal myself, to be the person I really want to be. I don't want to bring energy of anger, cursing and revenge into my life. I want to bring love, support and the highest purpose being served into my life.