If you are in a dispute with another user, then the first thing to do is to work hard at finding a way to get along. You are the best person to solve a problem like this. It may not always be possible, but it's important to make a genuine effort to do so.
If you are still having problems then you should talk to an admin on the community you are on. They may be able to help mediate the argument and help you resolve your differences.
In general, staff will not get involved in individual arguments, it's your responsibility to work through them with the help of your admins.