How are you being spammed if it's being sent to a different address? Do you mean it is sent to your address, but intended for the other? How do you know?
My email address is kilo24.co.uk (obviously that’s not my real email address) and it’s a constant stream of crap addressed to a kilo24.com arriving in my inbox and spam folder.
Years back I did receive some legit emails for kilo24.com so the person and email does exist in USA.
How, if at all, can I stop being spammed which is aimed at an email address which is the same as mine but the .com version not my .co.uk?