Place it immediately after the expensive request appears on screen, so the refusal answers it directly. Follow it with Sad Violin to underline the defeat, and open the sequence with Wrong Answer Game Show when the request itself is the mistake.
About this sound
This short Spanish voice clip delivers the line “No tenemos fondos” — “we have no funds” — in a flat, matter-of-fact tone, as if shutting down a request before it goes any further. It feels dry, resigned and a little comic, the kind of deadpan refusal that lands because it sounds final.