Harassment

So the other day my lead asked me a question “ would you like to work in the back load and help out ? “ It was after my 3:30hrs of shift so I took the question as he was giving me an option so I respectfully declined since it was late and was tired of doing bulk . He later came back and said I’m going to let that shit slide but next time if I don’t agree he’ll hold me to insubordination. I felt he was trying to retaliate. Then laughed at the fact that he was asking me to work more while other workers were standing around talking it up . He started screaming at me and pressed up against me . I remained calmed and as he tried to intimidate me saying he thinks I’m joking and he doesn’t play these game and walking around huffing and puffing . After the fact another lead came and asked what happened so I told them . Then soon after the supervisor took both of us into the office . At neither time did I have a steward . I mentioned I did not feel comfortable since the day before the guy mentioned he had a gun in his car and when the misunderstanding happened he was saying things like ok find out and he don’t play that .
The supervisor seemed to be avoiding writing anything down or even allowing me to talk to a file a grievance . They figured a simple handshake and apologies would suffice . I shared my side of the story with the steward after the kept insisting I wanted it noted . But ultimately nothing was and I had to sign the ups anti harassment policy where my steward said it would be best to RTS it . I’ve only been there 60days since October and honestly I feel they want to get rid of me . I’ve had perfect attendance and never had an issue . What should I do because the supervisor said they couldn’t change my position and put me in another loading station since they would have to accommodate everyone who has a similar issue . I just feel life at UPS will get worse after that experience .