Unlike MM, who seems to think this whole thing is an adversarial competition, I tend to cooperate and get cooperation back. When US made a mistake in redepositing miles for an award I used, I told them about it the next time I called and they corrected it. It was the right thing to do.

A few months later, when something was missing from my bag, I called them up and filed a claim with an estimated amount. I was getting worried that it took so long for them to call me back to get the details when a check for the full amount showed up. I like to believe what comes around goes around.

If you've tried and it has not been corrected, I would then say you have done your fair share and can keep them without concern.