Firstly why would you do that to anyone, how would you like it if someone did that while you were working, they were well within their rights to tell you not to use such foul language, secondly that is a long rant just to complain that Mojave wasn’t installed on you’re device, something you can do yourself in around half an hour.
I reacted, not "acted. I gave myself time to chill, then I apologized to the support person, and I upgraded to 10.14.18 by pressing option-command-r. It takes you to the latest OS, instead of the original OS your computer came with. You're right, about a half hour.