private static void sendRefuseOfferPackages(String buyer, String service,
			List<String> usersToRefuse) {
		SerializableRefuseOffer refuseOffer;
		SelectionKey key;

		for (String refusedSeller : usersToRefuse) {
			refuseOffer = new SerializableRefuseOffer();
			refuseOffer.userName = buyer;
			refuseOffer.serviceName = service;

			key = Server.registeredUsersChannels.get(refusedSeller);

			if (null == key) {
				Server.loggerServer.error("The user is no longer logged in");
			} else {
				Server.sendData(key, refuseOffer);
			}
		}
	}