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Gigantic point amount on rewards card - what are potential consequences?
Most likely scenario (A): You spend tons of time and effort talking to them, with the end result that they take away the extra points.  You feel screwed having to do their job for them - they've given you no benefit for looking out for them, and you're left with the points you've earned but maybe less desire to go back and use them. Most likely scenario (B): You just use the points, they eventually figure out the problem and fix it.  They send you a nasty letter, demanding some sort of compensation that they have no legal obligation to (because points are not money, you will have rendered existing points for service, and they have, per your existing phone call which can be substantiated in existence though not content through phone records, confirmed that they are yours) - they may go so far as to bar you from their premises.  If you don't use enough points to go "negative" before they fix it, you may avoid this. If they can deal with this competently from a customer service/PR standpoint, then in scenario (A) they may understand you quickly, and they may leave you with some extra points for your trouble.  In scenario (B), pretty much the same thing - they'll let you have the points you used and even leave you a little extra. I suggest in either case you only engage in written communication with them or, if your jurisdiction allows it, record voice conversations.  You need a record of what you've been told.