Just some update...
I have went to argue with the agent, and she looked "surprised"
It "appears" that vendor lied.
Vendor claims the person (vendor's mother) had died on the way to hospital, not inside the flat.
what I have is Letter of Administration which states that "[her] dead body was found in [the flat address] on [date]".
My lawyer was able to get this due to proving Good title.
The vendor said he will get death certificate should say she died on the way to hospital, and he will get it to me today.
But I highly suspect the court (letters of administration) made a very detailed mistake on where she died.
let's see.