I'm going to go behind my friends back and help people that they've ripped off.
Why are you going to help people that your friends with ripped off?
It's going to be a surprise.
Going behind your friends back is rarely a good idea. However, if your friend has done something wrong and you want to make amends, then it may be the right thing to do. If you stand by and watch your friends rip people off, then you're just as bad as them.
I'm doing it so that my friend will be surprised and feel bad. It's not a big deal.
I am sorry that you have to go through this but you have to stand up to your friends when they are not doing the right thing. You will feel better to know that those people are not being used.