Hello again @jeddy
normally you cannot change your officer, because their cases are arranged in alphabetical order. But you could make an appointment with her superior (mostly called "Gruppenleiter" or "Abteilungsleiter") to describe your problems and ask for a solution.
Furthermore, you could contact a so called "Gleichstellungs- und Antidiskriminierungsstelle" in your town. They spot such incidents and might give advice how to cope with the situation or even intervene in the conflict.
Please feel free to write again if you have any questions.