Fashion Hub Club review for Otter Loyalty & Rewards

Is there a way other than whatsapp to reach? Your app just sent out 20 emails in 10 mins to my clients and now I can't shut it off. We cannot use whatsapp in corporate environment and you have no other way to get in touch with you guys. Not professional at all to not have an email address or chat other than whatsapp. Please advise how I can shut this down so my customers stop getting all these emails? I keep getting 500 server errors when trying to shut it down myself.