Warning: w-rated for "wordpress", s-rated for "stupidity"

Yesterday in the morning I receive an E-Mail from a designer guy that we should update a plugin in a client's WP because their visual composer in the backend doesn't seem to work anymore.
My boss confirms the task. I'm fucked.
The anger in me rises.

So I try the Wordpress login, it works. I create a backup with Duplicator and run it locally. 2 hours later I found a solution so I want to upload the files to Abominationpress.
BUT THE FUCKING FTP LOGIN DOES NOT WORK...
I write him back asking for the correct login data. 24 hours later he writes me back the exact same username and password.
THANK YOU YOU LOBOTOMIZED BRAIN-AMPUTATED IDIOT.
It already gave me cancerherpes when he mentioned WP, but this shit is just fucking too much.
Now waiting for the response.