Did I ever tell you that I solved the three wishes problem? As far as I can tell, this issue has vexed mankind at least since magical wish-granting first appeared in folklore. There is exactly one, single way, at least in languages which have a definite article, to use three wishes incorruptibly:

"I wish¹ that this wish² I am making is, always has been, and always shall be, theᵈᵉᶠⁱⁿⁱᵗᵉ ᵃʳᵗⁱᶜˡᵉ correct wish³."

Note that this doesn't prevent other wishes from being granted, it only means that they are/were not, strictly speaking, correct when they were made, and they are/were granted only by coincidence or as an extended consequence of the correct wish being made at least once by some wisher.

It partially reflects the nature of wishing as an expression of desire, and desire, being an emotion, cannot have a moral value of either right or wrong, nor A correctness—at worst, emotions can be inappropriate for the circumstance, but because they are not something that can be controlled directly, they do not constitute choices and are therefore ineligible for judgment. It's our reactions to our emotions, which we do have control over and bear responsibility for, that are right or wrong, correct or incorrect.

It's also impossible for any djinni or other wish-granters to refuse it, or rather, it's irrelevant if they do; they don't actually have to do anything, since it already actually is the correct wish—and the only one, at that. It always has been.