Are they asking you to work on that project permanently for would it be <6 months. If it's short term I would just agree to work on it while letting your manage

Are they asking you to work on that project permanently for would it be <6 months. If it's short term I would just agree to work on it while letting your manager/whoever know it's not your preference. That way they know you're doing them a favor, and if they try to shaft you again you have a much better argument to refuse: "This is not what I was hired for, and I already worked on my non-preferred project once before." If they shaft you a second time I think it pretty much shows they don't respect or care about you and you can feel fine quitting.