I'm afraid our shared whatsapp gateway number has been banned from whatsapp and won't be sending messages anymore nor it will be managing the signup requests.
We'll think an alternative through but, for now, the service is down.
We're grateful to the hundreds of users and sorry for not being able to continue delivering their messages.
I hope we'll come back soon with some alternative. For now, we need to continue working with Telegram which is way more open to these type of communications.