My manager recently asked me to complete a pretty lengthy task, this is not my job role, it is someone else’s who is working but is snowed under with work; however she asked me as she knew I would do it. I am part time working 3 short days per week, I agreed I would complete this task once I have completed my own job roles first, she is now annoyed because it’s been over a week and I haven’t completed this, to which my reply was I was doing her a favour by doing someone else’s job role, I need to ensure my job is complete first and I’m doing my best, she isn’t happy with this as she says she is within her rights to ask me to complete any other role and it is infact in my contract - along those lines. Would I be wrong to argue this and state I no longer want to do this task, especially with the added pressure and attitude (wouldn’t say this) when there are others in the company who are there more than I am, therefore have more time to complete this.