How do you stop from picking up job responsibilities you’re not being paid for?

I was told I was in line for a promotion someone else got. That person isn’t good at their job and now I do a lot of the things they’re supposed to. I don’t know how to refuse to do them without being petty and whiny, but they are the very things I was told I wasn’t capable of doing. (Aka the reason the promotion went to him) I’ve been doing them on and off for 6+ months, there isn’t another position opening up anytime soon and they don’t see a problem with me doing other peoples work for them.



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