Eldorado.gg bad business practices

Scammer's profile link: @EldoradoGG
Amount scammed: $138
Discord ID + Unique Discord ID: No discord needed
Proof that it's their Discord: No discord
Explanation of the trade: I joined their platform with the intention of growing my business. So far my trades have gone smoothly. I have 2 negative feedback. One because I forgot to turn off my gold offer and I went AFK. So I wasn't able to respond to the buyer. I reached to them afterwards to apologize regardless. 2nd negative feedback was someone who left a negative feedback just to spite me after a successful trade. I contacted their customer service and they said "We don't remove any feedback" and completely ignored me. Here is proof of an unnecessary negative rep - https://i.imgur.com/r69g8jg.png
How they scammed:
I sold 400m ($138) to a customer. Who decided to launch a dispute and pretend like the gold was not delivered. I caught him lying several times and Eldorado support refused to look into it. They just asked me for some impossible documents to prove that the gold is in his account. They ignored everything else.

Other relevant trade screenshots:
The entire chat between me, the customer and eldorado support - imgur.com
The only proof of delivery I have - https://i.imgur.com/zNUzDWU.png (redacted RSN - BlackBlasses; Please always censor RSNs, or any other sensitive information)
Chat with their support:
https://i.imgur.com/s3Wtk9D.png
https://i.imgur.com/1erNKbA.png
https://i.imgur.com/syMUUsF.png

He said he's from Dubai, so I said "Inta wahid scammer, wallahi" to him in Arabic. Which means "You're a scammer, I swear" But then he lied and translated it to something completely different - https://i.imgur.com/EWXNpHV.png

I caught him in the lie and told their support but they completely ignored it.