Do not assume a duplicate payment solves account access. Reconcile the actual transaction and application record through official instructions first.
Separate an access problem from a new payment obligation
The current US$15,000 processing fee is nonrefundable under the published terms. This page promises no refund for a duplicate payment and does not treat an extra transfer as a way to create or accelerate approval. Separate the question of whether something has been paid from the question of whether you can see the confirmation, because paying again answers neither.
A payment already made exists in the payment record whatever inbox the receipt reached, and the way to establish it is to reconcile the transaction against the account statement and the application record through the official process. A second transfer adds a second transaction to reconcile and, under the published terms, the processing amount is nonrefundable, so a duplicate is not a neutral act. Establish the position before sending anything further.
A related caution is worth stating plainly: no payment accelerates a decision, and no payment substitutes for eligibility, admissibility or an outstanding response. Where an amount is genuinely owed, the instruction to pay it comes through the official process and names the recipient and the purpose. An amount requested by any other route deserves confirmation against the official record before it is sent.