Darood/Salavat Ibrahimi 3 times......the one your read in Salah
"Auzobillahi minish shaytan nir rajeem"....once
Surah Nuh once
Same darood/Salavat 3 times
Then do a dua like this...."Ya Allah what ever black magic there is on me, my wife, my children, my family, my house and my business return it to the person who did it. When you return it please reveal that person to me".
You will know when the magic is finished when you will see that person in your dream or in reality some one will tell you that so and so did it. You will find out about the culprit. That is when you can stop doing the wazifa.
Note: You will not read Bismillah in this wazifa any where.