Fed up with association/assignor...

[RefCT]

Assignor is completely unapproachable and is rude and will interupt.

This raised my red flag and I suggest you look at how you are presenting the message.

As a manager, when someone is unapproachable, it usually means I have to change the way I am communicating my message. People receive and react to confrontation (and ways it is presented) in different ways. If he was completely unapproachable, he wouldn't be where he is. I suggest doing research to figure out how to best communicate with his personality type and then changing your message to match how he will best receive what you are trying to communicate/ask.