This just happened to me, a few minutes ago:

Colleague: Could you please call xyz and ask how we can administer their server and ask about the bug?
Me: Sure, gonna do this after lunch.
[...]
Me: So I called xyz, and we're now able so ssh into the machine to administer stuff [...] and they'll check the bug.
Colleague: Oh yeah great, I called xyz a hour ago and we're all set didn't they tell you?
Me: No, they didn't.. (YOU GOD DAMN PIECE OF SHIT!)
Colleague: Oh an what about the bug?
Me: ...

It's totally fine if you're going to do it yourself but WHY dou you WASTE MY TIME? You could've told me that you already called them! 🤬