"This pack also includes a sample map made using Rpg Maker MV."
RIGHT THERE RPG MAKER!
Putting something like that highly implies it is for RPG Maker.
Viewing post in Need refund for fake paid tileset
I read your thread on rpgmakerweb. Since that thread is closed, you will not find validation here. You are in the wrong.
Buying a 24x24 tile set, clearly advertised as 24x24, and then whining that you can not use it in an app that uses 48x48. Oh wait, you do not even have that app, you need it for a different app, that uses 32x32. What a drama.
"Rpg Maker"
There's your problem m8. You wouldn't be having these problems* if you were using Unreal Engine. Or Unity but that thing has a bad rep nowadays.
For UE, tiles can be any size, probably in Unity as well.
*Instead you'd have completely different problems, like conditioning the sprite sheet and paper2d.