A Note from Landlord

This morning, I found a note on the ground outside my front door.
It said:

Dear tenants,
This is the homeowner of ...
We would like to discuss an important matter regarding the house with you.
Can you please give me a call?
My phone number is .......

The phone number on the note was exactly my landlord’s number.
So, I called my landlord, but he said he had no idea who wrote it and told me to ignore it.

What kind of scam is this?
No one would use the real landlord’s phone number if they were trying to scam someone.
Who can give me an answer?