I don't want to pay for work we didn't ask for
Can you tell me more about the work that you didn't pay for?
It is just a waste of time for us to have that done
You don't have to like it all. But the work was done for you and you need to pay people for their time and labor.
Fuck it. But I'm going to pay less.
It's important to consider how you would feel if you were not paid for a job that you completed. Not paying for a job will have a negative effect on your reputation and people will not want to work for you in the future.