what if you get a message every five seconds and if you don't answer they show up at your desk?
this sounds like a pretty hostile work environment. as much as it pains me i have to agree with finn. (it pains me to agree with finn and also because i hate human resources) but it's time to get somebody involved in this. whether it's hr or a supervisor or somebody. not really knowing the structure of your workplace. nobody should have to put up with this nonsense.what if they are someone that retaliates through passive aggressive behavior?
i tend to have zero problems blowing everything up, burning bridges and leaving a disaster behind me, but i know that's not how most normal people handle things. so i'll let more responsible/reasonable people advise you.