Used that "free" money for the full 18 months then paid it off when the intro period ended. Went on to other cards, offers, etc.
In today's mail here comes a snippy letter saying that "because of minimal activity on the account in the last 12 months" they are lowering the credit limit to $7,500 They didn't say from what, and I can't recall what it was after all this time. Think $12K or $15K sticks in my mind, tho.
Obviously, they look down their noses at laggards like me

I can't recall this ever happening before. My usual experience is cards threatening to cancel for inactivity; after using, they are all happy & smiles again.
My concern: Is this going to lower my FICO score? For many years now it bounces back and forth from 827 to 847. I most definitely do not want it to go below 800 - My credit "utilization" factor is well below 10%, more like 6% I think.
Should I call AmEx and ask them to "review" their decision as they say in their letter?