Hi,
Same happend to me. I submitted both fee on April 19th. Payments were out of my bank account on April 20th. Then we submitted all the required documents in hope of review. In first week of May I received an email that the payment is rejected. I contacted NVC through public inquiry form. They replied a generic answer if the status shows rejected then I will have to pay again. Duplicate/rejected payment will be credited in 30 days. Even though I provided them my bank statement that shows both payments paid to them..I also contacted the pay.gov on the phone. They said that the agency took the payment will authorize and refund not pay.gov. its such a bad system. I didn't want to wait 30 days so I went a head and paid both fee again. I also contacted my bank for the duplicate payment. They said that I can file a dispute but I am waiting for nvc 30 days period which is approaching soon but I don't see any refund so far. I will wait till next week before I file a dispute with my bank. I think they have issues with their system at NVC. I have seen post back dated from 2015 with same issues. 🙃🙃