My phone was seized 5 months ago and I still don’t have it back

In December 2023 my phone was toon by the guards. I voluntarily gave it to them and signed a form ( can’t remember what it was) I was told that they should have it no longer than a week or two just to retrieve deleted messages. I’m genuinely so mad that I still don’t have it back as it was only new (iPhone 14). What should I do

Ps I’m 17