Finding IP address to complain about privacy breach

Hi - recently someone within my organisation accessed personal information of mine, and I need to make a complaint, but although I know the information was accessed, I don't know who by. The IT department aren't being helpful, or don't seem to care (or possibly were even involved!). Technically what they did is a criminal offence, but I can't imagine the police are going to care enough to do anything about it or find out who did it. My employer …

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