This is about a non-academic issue I've had with a student, who is outside of my department, and I would like to know if I should pursue it or just let it go.
I recently moved to the US for a postdoc and I sublet a room for a student over the summer. All interaction between the student and I was friendly and I enjoyed staying in her place. At the end of my stay, she told me that she would not give any of my deposit back and the reasons she gave me were, frankly, ridiculous. There was no damage to the apartment that needed to be paid for. After explaining to her (politely) what the purpose of a deposit is, she eventually gave back half of my deposit. This was just a check in the post, with no explanation of why she withheld the rest of it. I asked her to give me a breakdown of what she kept me money for but she has ignored all my emails since sending the check. Without evidence of what she has kept my money for, I see this as blatant theft.
So, my options are, do I go to her department and make a complaint because I have no other way of contacting (after moving out she asked me to only contact her via email), or do I let it go? If I make a complaint about her, could it backfire on me professionally?