Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

Gigantic point amount on rewards card - what are potential consequences?
First IANAL! This is going to depend on the kind of points. If it's an internal point system that the business is doing on their own, then they may very well, give you that many "extra" points. They may really not care. Specially if the cost of the points is low enough. Remember that steak dinner that you paid $60 for only really cost them $2 and that they use $60 worth of points on it.  If the point system is tied to a bank or credit card, then it's far more likely that the "just use them" is not the proper answer. The company doing the reimbursing is giving the location $60 and using your points. The points have a much higher value.  With that said, your responsibility is to notify, and follow their rules. So notify them in writing, and use the rewards card as you normally would. If your being honest, then the worst that happens is that your point balance is a little negative (because you spent 100 points but really only had 98 after adjustment).  Most likely, if your being honest, they will just eat the few points over that you went on accident.  If you get an answer in writing to just keep the points, then I guess you know where your daughter's wedding reception will be. Let's hope it's a classy place. Of course, as a 'good' person (or maybe a 'stupid' person), I should call them, (wait 30 minutes in the queue), and then try to explain the issue to the service desk. I actually did that, and the guy thought I am nuts to even call, and told me to 'just use them they are yours now'. I don't feel like calling again and again until I get someone that believes it, just to return them their points. You will want to do this in writing. Email will work, but you really want a paper trail, either way. I could just toss the card and forget about it. However, I had quite some points on it that really belong to me, so that feels like I pay for their fault. There is no need to do this. It's like a bank error. Talk to them and they will give you an answer. In the mean time, do your best to only use the points you actually have. Use them and play stupid. It's not my duty to check their math, right? Probably nobody will ever care (let's keep religious considerations out here). What would be the consequences if they do realize their error some day in the far future? (I understand this borders on a legal question). Nope, don't do this. If you play dumb and spend 5000 points when you know you only have around 100, best case scenario you end up with -4900 points (effectively canceling the benefit of the card). You may also be banned form the program, the location, the network, etc. Worst case scenario they want the monetary value of the points and sue you for it, and the legal fees. It may even be considered fraud.  TL;DR Use your card, but be honest, and handle the mistake in writing.