Did you buy on brewstock.fr as a consumer? You can withdraw from your order without giving any reason, within 14 days of receiving it (Article 15 of the terms and conditions of sale). Fresh hops are excluded.
The number is in your order confirmation email. With a customer account, your orders are also in your customer area. For a 3-harvest contract, use the “My contracts” section of your customer area. Any questions: contact@brewstock.fr.