What recourse do I have if my mobile phone and desktop computer have been hacked and there’s evidence who did it?

When I did a search of my mobile phone number on those websites that provide information about people. The results of each site showed 2 people as being the owners of my number. One of the people has various aliases and each one is listed as the owner of my number. One of the aliases has the same last name as the person I suspect stole my dog. The second person who’s listed as the other owner is related to the first person. My number is also listed as their current primary mobile phone number but they have a different carrier than I do. I have a feeling my phone has been hacked using my phone number. I read this is possible. There are also several anomalies on my phone which point to it being hacked as well. I would like to go to the police but I need to have concrete evidence that proves that it was hacked and by whom. Someone told me that an identity theft lawyer knows how to determine this and then could question the suspects. Should I hire an identity theft lawyer?