Let me explain:
The buyer argued:
no my friend, I ordered 1000 words as you advertise.
It feels really itchy when you read the line. Technically speaking, as your gig provides 500 words for $5 then 2X500= $10. You are the one who knows about the advertisement. If you are right in your position, then ignore him.
and As for the threatening: "I live in London, You live in Pakistan"
I take everything easy as possible. From that perspective, this line is like this: "How can I threat you from 3784 miles away. There is no reason to do that"
if it’s not like this again, then ignore… for good