What do you mean by it didn't work when you tried to re-upload them? As far as I am aware, uploading duplicate files might produce a warning but you can just click right through the warning. If by "wrong name" you mean that you uploaded imageA as ImageB, then it is even easier. You can just go to the imageB page and upload the correct file as a new version; no need to delete first.

"I accidentally uploaded some files but with the wrong name"

You can just rename (move) an image. No need to delete and re-upload.