ban injuste

Bonjour, ce sujet en me concerne pas directement mais concerne un de mes élèves qui a eu une croissance et une amélioration fulgurante meme en présentiel cependant son compte c'est fais ban récemment et étant assez confiant qu'il n'a jamais triché en ligne demande un unban si possible et aussi j'aimerais bien savoir comment contacter chess.com pour cette demande

Only the banned player can do anything. They would have received instructions on how to appeal the closure.

he didnt receive any instructions on how to appeal tho

An email would have been sent to the address on the account. Your student should check their spam folders.

Of that can't be found, then they will need to open a ticket with support from the email tied to that account.

https://support.chess.com/article/346-contact-us

hello it's been three days since my student send an email to chess.com (and i did too) and still no answer how long shall i wait before getting an answer?

Support staff have been receiving a lot of tickets, so it may take some time for them to get to the ticket. 

If you look at the profile of the closed account it will have a link to the article explaining that closure type.