Why the cardiac arrest over a mistake that will be corrected. If it changes your status or makes you miss the next e cert accumulation you can call AC and explain your situation. I have never seen them NOT react positively to a situation like that.
Fact is it was an IT screwup and it will be corrected. My bank has made them, very few admittedly, among other institutions I deal with so it does happen. We don't live in a perfect world. I'm sure that if the mistake was in your favour you wouldn't notify AC as statistics seem to indicate.