University Stiffing Interview Reimbursements

[PsychSecret]

Hoping someone may have some advice here. I interviewed for a Social Psych PhD program in late February. I was admitted to the Masters program but turned it down in favor of another school. I flew out for the interview and was told I'd be reimbursed for a portion of the flights. Since then, I have turned in my reimbursement documents (via email and mail) and followed up with the department now 5 times, both with the grad coordinator and my would-be POIs, and have gotten the silent treatment. No one will answer my emails. Any advice on how to proceed? Perhaps who to reach out to next, etc? I really feel like I'm being stiffed because I did not accept....

 

[RomulusAugustulus]

Is there a department secretary/administrator? That would be the person who would normally deal with financial issues.