An American comes to a lawyer and asks for advice.
My neighbor owes me $500 and he doesn’t give it. Can I give him that money?
You can, but it requires written proof that you owe it. Do you have such proof?
I am afraid that not. He just took me so.
Then write him a letter and ask in that letter that he immediately return you a thousand dollars.
But he owes me only $500!
That is how he will answer. This will be a written proof.