Some people have experienced success by pushing. The more success they get using that tactic, the more they push. I agree with everything that has been posted and just wanted to mention that I'm sure this has worked for them to get their way. Unfortunately, we have to deal with the impact of how people have learned to deal with conflict throughout their life. This has to be so embarrassing to be declined. I think I would try and find some resources on how to fix the problem and direct them there to focus on solutions rather than the problem. Sometimes people just want something, resources to help them. This might change the subject to let them know the decision is final, now it's time to move on to sharing some resources to help them fix it! YouTube has a ton of videos. Watch anything you share first, this one was interesting with 41K views.