No — repeating the charge blindly risks losing another non-refundable US$15,000 without moving anything forward. Verify first, through the official channel, whether the first payment registered against your file. Only that US$15,000 processing fee is described as non-refundable; other government, medical and professional costs are separate and additional.
Money already committed, money still ahead
For an individual principal the structure is US$15,000 now and a US$1,000,000 gift when instructed after successful vetting. A couple joining together reaches US$2,030,000; a family of four reaches US$4,060,000. Those figures sit apart from immigrant visa fees, medical examinations and any professional representation you retain, which can usually be quoted in writing before you engage.
Paying twice for the same step buys none of it. Before repeating a payment, work out who could actually confirm that the first one landed. A card issuer can confirm that money left the account; only the official channel can confirm what was recorded against the application.
Those are two different facts, and the first does not establish the second. Put the question to the party able to answer the question you actually have. Keep the obligations separate by whose they are as well: the processing fee is yours and is described as non-refundable, the later gift is a payment you make when instructed, and government, medical and professional costs are owed to the bodies that charge them, each on its own schedule.