I think it would make the creator think you disrespect their efforts. If you thought the shop is far from your liking, you should've not chosen them. Or maybe if they are good but the poster is not like what you expected, some of the shop can remake it

If they have rules to use the poster for a certain amount of time, then you need to use it, or request a re-do. If you don't use it, and het another made, then the makers will feel cheated.