I live in a block of flats and my next door neighbour (although a lovely fella and actually quite cute) has many many people knocking on his door. There are many a time when someone will ring my bell and I answer it and say "xxxx off you are ringing the wrong number please ring xxx.
Some are quite polite, some are obviously a little peeved that I have told them to "go away".
Anything for a peaceful life me, but I am sure one day they will knock on my door and not just ring the intercom