My favourite variant of this merrygoround is when they ask you to demonstrate the issue live in a Teams session, you do so, and there's this moment of silence followed by an "Oh... I see".

Then you assume, naively, that this means that they've recognised that there really is a product problem and will go off and fix it. However, then in turn the support tech needs to reproduce the the issue to the development team.

They invariably fail to do so for any number of reasons, such as: This only happens in my region, not others. Or the support tech's lab environment doesn't actually allow them to spin up the high-spec thing that's broken. Or whatever.

Then the ticket gets rejected with "can't reproduce" after you've reproduced the issue, with a recorded video and everything as evidence.

If you then navigate that gauntlet, the ticket is most typically rejected with "It is broken like that by design, closed."