There are many supplications for victory on wrongdoers, like:
1. Repeating this Quranic Du'a:
RABBI INNEE MAGHLOOBON FANTASSIR . (AL-QAMAR ;10)
2. Repeating Ayatul Kursi 7 times a day.
3. Reciting Sura Al-Nassr ( إذا جاء نصر الله والفتح) in the daily Prayers.
4. Repeating Istighfaar, Salawaat and Laa Hawla Wala Qowwata Illa Billah)
5. Reciting Du'a Al-Jawshan Al-Sagheer.
7. Getting the Du'a of the parents if they are alive, or visiting their grave and seeking from Allah (SWT) while your are visiting your parents.