How to find my old invoices

[SAGreg]

Hi, I'm trying to contact someone, anyone, at 3CX so I can get my old invoices. The person who used to manage our system is not around so I'm tidying up some old paperwork. I can't find anything like this on the dashboard or in admin settings, and when I "contact 3CX" it just gives me a useless AI bot that tells me it can't help me and sends me here. Is 3CX staffed by actual humans who can help me find my old invoices? Does anyone have any advice on this? Thanks.