I work in a residential housing project. Staff share one of the kitchens with residents. This week one resident has had a real problem with me using the kitchen to make coffee and told me I shouldn't be using it or putting my sandwich wrapper in the rubbish bin. Today she told me I shouldn't be using her facilities and things, I told her that as a member of staff I was allowed to use the kitchen. I went and got another staff member, she followed me and started telling me I was really unprofessional. I then had to go on another appointment and left the other staff member to calm her down as she was very agitated.
My manager called me this evening to say this client has made a 4 page complaint about me. I gave my version of what's been happening this week. My manager said it was very different to what the client has said. I asked my manager if I could see the complaint. She said she didn't know and would ask HR tomorrow. I asked her what the potential implications were for me and again she didn't know and again would check with HR.
I know I'll get a bit more info tomorrow but I haven't got a clue and feel really stressed. I've never been in this situation before so am completely in the dark. Should I be contacting my union?