Hextech "Rental" Needs Clarification or Removal

Title pretty much says it all. Got Dunkmaster out of my latest chest (only chest that has yielded a single thing I would want), and decided I would give it the old test run before I dismantle everything I have to get the 1500 essence to unlock it. BOOM GONE NO MORE DUNKMASTER FOR ME When people read "rental" I assume I'm test driving the item and will then get to decide if I want to use a ton of essence on it. But that's not the case and I'm beyond pissed about it. I would not have used this feature had it been clarified on. Is there any way to hit "undo" or something? Cause this is the least cool thing Riot has ever done to me personally.
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