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Gigantic point amount on rewards card - what are potential consequences?
I would behave exactly as I would expect it from others. If you were the one giving away too many points by accident you would be thankful if somebody notifies you about this error. You can write a letter or call them. I would not use the points (of course only not use the points which are added in error). Other options are possible but I would advise against them. It's just about fair play and the points are clearly not yours.