There is no escaping Karma, but you can’t bring it on yourself. If someone was done you wrong, then when the time is right then karma will step in.
It is the same with goodness, I have seen many people do good things, give things away they can hardly afford and I’ve see them reap the rewards by getting things come back to them in abundance and with love.
I dislike unfairness and feel helpless when I see or know of something that is wrong and there are times when I have wanted to step in. However, patience has shown me that no-one gets away with things and I have seen with my own eyes how karma works.
So give out what you want back and do it with a kind heart, it will come back to you.