Is NOBODY wrong in the post ? POST : I'm a sales manager in a call center so I know naturally I can be loud and very forward but I can't stop thinking about this interaction. 

We are implementing a large software to completely redo our sales process. It is a very large project commissioned by our COO and CEO to help get us way from some very old/bad habits.

One day two guys show up, shake hands with our director, and walk into our conference room. One guy is introduced as a systems engineer and another a business analyst. They came from corporate to work with our front line employees at improving our sales processes then implementing it with the new software.

Word got around they were from the IT department and as much as we've told people not to, people approach them asking simple break/fix IT questions claiming the phone number they have to call never calls them back, putting in a ticket takes too long. 

This has caused a lot of frustration between us all. My employees help requests are refused then our director is emailed by them reminding them how to get in touch with the service desk. I've tried several times to tell people not to approach them. So we are already on uneasy ground.

This morning I realize they are parking in another business's parking spot. (shared parking lot.) I walk into the conference room to let them know but they are on a conference call and I get the "wait a minute" finger. I walk out.

An hour later I think "Surely it's been long enough, they are off now." (This other business owner has had real fits when we park in her spots.) I walk back into the conference room, it's all quiet besides the tacking of their keyboards. I ask them if they have a second and the immediately point back to the conference phone right as someone starts speaking up. I, without meaning to, shout "Come see me after you're off!" 

An hour later I'm in my director's office talking to him &amp; our HR rep when the system engineer walks into the office staring me down. He asks what I needed him for. I start telling him about where and how we can park and the other business owner getting mad, etc. He visible turns red, looks at everyone in the office then back to me and says. "This could have been sent in an email. If you or your employees keep interrupting me or the business analyst we are going to pack up, go back to corporate and the COO will hear all about the issues we've had working here. If you have questions about the new software, ask, other than that, please do not approach us anymore." I could only gasp out "Okay" while I turn to look at our director who is just as shocked. The guy just left the office and went back into the conference room. Now we are all sitting here uneasy. Our director is even called a meeting and told everyone to not go anywhere near them. He also has a conference call planned with their boss later today.

AITA here?