This is because one of them received my post at their house, most likely because the postman (or postlady) accidently included it in their lot, however, instead of slipping it through the door they wrote "RETURN TO SENDER" and sent it back.
Now this is not normally a problem, however, it happened to be SOMETHING THE BANK SENT ME, thus, throwing up an alert when my loan application was going through. In short it suggested I was a lying fuckwit and didn't really live here.
But because the person I was dealing with had some sense to notice I was only one item of marketing rubbish she just informed the system that it's a whore and should get it's facts straight.
I'm up for a bit of 0wning now. If I receive a letter postmarked for another house on this estate I shall do the exact same thing, see how they like it.