No, think of them like money. When you buy something, you can't just get a refund by destroying the item. You spent the points to buy the game.
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no you don't once you buy it your points are gone forever FOREVER
No, you do not get your money back if you delete an app you paid for. Once you bought it, you cannot get your money back.
Go into your Xbox's hard drive through settings and find your profile. When you open where you save your game data, go to games and find the game you're looking to delete. Once you have found it, delete it and be on your merry way.
50 points
Just start a new game and once you get the chance go the the menu and press "Save". It'll say you already have another save file and asks you if you want to delete it. Say yes and there you go. Hope this helps :)