Evo par "rješenja" sa jednog foruma
Instagram’s support email:
support@instagram.com
Just contact Instagram support and be patient. It may take some time to return it back
Ovo donje radi preko
mobilne APK, ne preko PC/browsera
This is the link to report a hacked account that you no longer have access to on Instagram. Click on “I think my Instagram account has been hacked.” Then, scroll down and choose iOS or Android and follow the directions. You may have to have your client do this because it asks for specific information for verification. You will be asked for a phone number and/or secure email address. I believe you can choose a different email address at this point. Hope this helps!
[Report Hacked Account To Instagram ]
https://help.instagram.com/368191326593075