Winners will not receive any form of notification through the post, phone or email from the US Department of State. Likewise, if you were not selected the US Department of State will not notify you.
You are responsible to keep checking the status of your Green Card entry online to find out if you are a winner. You can check online for the D.V 2020 results between May 1, 2019 – April 30, 2020 to find out if you are selected. If you are selected, instructions on how to claim your Green Card as well as information on fees will be provided.
Note that no-one is authorized to send you any form of notification concerning your Green Card entry. Therefore if you should receive such notice, ignore it.