Place this clip right after the reveal in your edit, once the contradictory message is on screen. Open with Abriu o Áudio to set the chat context, then follow this line with E O Pix Nada Ainda when the excuse is about a missing payment.
حول هذا الصوت
This is a short Portuguese voice clip, about four seconds long, of someone starting the line 'Então quer dizer que...' and letting it trail off unfinished. It lands with sceptical, amused disbelief, the tone of a listener who has just spotted the hole in an explanation and is waiting for the other person to realise it too.