In the Friends of Animal Forest Association, if the otter trade is rejected, the otter will disappear within a period of time, and I don't know how many scallops will be needed to summon again. However, there are rumors that if the player is strong enough, he can challenge Artu again and trade him with new scallops.
Players are advised to be patient in the game and try their best to complete all transactions and tasks in order to get the best game experience.