If you have a fear of any enemy…..or from anyone who wants to harm you in any way do the following until the threat is gone away.
In fajr salah in the first rakat of the sunnet read Surah Alim Nasrah and in the second read Surah fiil. Both once only
Insallah your enemy will be defeated by Allah himself. He will not be able to harm you in any way. Keep on doing it until enemy is defeated completely.