We understand that this is frustrating! When a chat is sent, the recipient always gets a notification, an email, a reminder email and a reminder notification on his account provided he is logged in on his app. If you make an offer, we also send an SMS to the seller, that will continue to get a faster response. Unfortunately, it may happen that a seller no longer responds, in which case we will send the seller an e-mail asking whether the item is still available. If no response is received within 2 weeks, we assume that the item is no longer available and take it offline.