If your university is trying to get you dismissed on false charges, there can be several options at that stage. One would be if the matter is still in the appeal stage, to appeal, the finding and the sanction the expulsion, that is, you'd be going through the school's process in that sense. Whether that takes place or not, if that has already taken place, in other words, another step that could be taken is an attorney can engage in potential discussions and negotiations with the school's attorney, the school's Office of General Counsel in terms of trying to come to some alternative resolution.
An injunction can potentially be sought to try to stop the school from doing as such in terms of trying to stop the school from dismissing the student. If need be, a lawsuit can be filed against the school, if there's some basis in doing so. If the school say, was in the wrong in terms of arriving at this outcome, defining that is and the expulsion, if there's say, due process concerns or if the school didn't follow its own policies, in other words being in breach of contract. There are various steps that can be taken because so much is at stake.
You need to have an experienced attorney advisor involved from as early as possible in the process to try to avoid, of course, a finding of responsibility and expulsion, but if that were to take place, especially to help try to dress the issue at that time.