It would be great if everyone was happy to drop whatever they're doing and lead resolution of customer's complaint, regardless of who the actual empowered/responsible person/team is. Alas, we live in the world where most people subscribe to Copenhagen Interpretation of Ethics. In this world, even forwarding a request to those responsible is dangerous. Anything more than that entangles you with the problem, meaning you'll be held responsible for it, no matter your actual connection to it.
We can call it "principal-agent problem", or just "survival in the world where requesters are hunting for anyone willing to engage with their requests".
(Source: I used to be the one willing to handle any internal request even tangentially related to my work, until my line manager told me to ask requesters for project ID or billing code before giving any help that requires more than 1 minute, because otherwise I'll end up doing none of the work we're actually being paid for.)