This is most commonly occurring problem when you want to message someone but the message will be sent to someone else or when you sent a message to a fellow then you sense that message is bad and you want to delete but which was not possible in Whatsapp’s earlier versions.
In updated version, Whatsapp introduces a recall option feature by which user can take back or delete the sent message within 5 minutes; unfortunately, this feature is available in some countries and will be available to all countries soon.