Double payment made

I made a manual payment to Wonga which unfortunately went through on the same day that the debit order was due to come off. However, I contacted Wonga on 28/04/15 to explain this and emailed proof of manual payment made at their request. I was then told by 'John' that he has the email I sent and will send it through to their Finance dept and said that it would take between 24-48 hrs to be refunded to my personal bank account. I then contacted Wonga again yesterday just to make sure and to get progress on the refund and spoke to 'William' who told me that he can see the manual payment reflecting and apparently forwarded the correspondence to their Finance dept to process the refund. Again I was told it would take between 24-48 hrs for the refund to reflect in my bank account. This morning that story changed to up to 3 working days and it is a huge amount which means some of my debit orders are being rejected because of insufficient funds! I tried to apply for a loan temporarily to cover my debit orders until they refund me, but now suddenly the system is not working and I can't do anything! Once this whole mess is EVENTUALLY sorted out,I am deleting Wonga off my list as a creditor