I second what Goldfinger is saying. Getty is brutal about this kind of stuff. You would be unwise to ignore this stuff….ask for clarification and for them to point out images that are in breach.
You’ll probably find that it is images used in your website template or something. Send them receipts for the template, the terms of use for the template and suggest they go sue someone else.
Don’t ignore them or tell them to go jump. I have clients that have fallen foul of Getty and they aren’t messing about.