I hate it

Ok, so if you have a name, and you really hate it, and people at your new job keep calling you that name... what do you do?

My name is Jessica, I hate Jess, I provide Boof for those who prefer a one sylable name, I HATE Jess, I prefer Jessi with an I if you must shorten my name.

Now, how to tell people at work when we don't have a lot of time to talk, and they always say it when I can't bring it up...

Peace and love!