Wonga loans not contactable after double payment taken off

Wonga is usually quite good but I repaid my loan a week before debit order was supposed to go off. I then got a reminder of the debit order the day before it went off so I sent proof of payment. The full amount was still taken off meaning I paid the loan twice. I understand that it takes a while to change debit orders so I am not upset about that. I am angry and frustrated because a week later and I can't even get a response. I cannot get hold of them and they haven't refunded my money. I even tried their ***** email contact.