Double Debit order

Rain debited double amount on our account at the end of July and to this day they have not resolved the issue after countless communication sent to them. This service provider is not realible and very unprofessional. Their system is total a mess. How do you debit double amounts and not make any means of refunding your client, especially during these difficult Covid times taking more money from your clients is so wrong and ********. PLEASE RETURN OUR MONEY BEFORE WE REPORT YOU TO OMBUDSMAN.