I have recently been promoted and my supervisors keep asking me to do my old job on top of my new responsibilities. They have not replaced me yet. I want to be a team player and help out but I feel it's important for me to focus on my new duties and not be forced into doing work that quite frankly isn't my job anymore.
Today I was pulled aside and reprimanded (I didn't realise it was a reprimand until afterwards, when I received an email from my supervisor to "recap what we discussed") and was basically told that I have to put aside the job I was promoted to and do the old job. They feel that I am not being supportive of the team because I don't want to do two jobs at once, and want to focus on myself so I can learn my new position. I felt bombarded and attacked when I received this email.
What can I do to protect myself from this happening again? I want to be able to focus on my new position and management does not seem to respect that.