Misunderstanding by my friend (translator)

Hello, dear supporter,
thanks for the reply.
My friend, which translates this email to English, misunderstood me;
What I wanted was:

My account, where I have access to is this :
https://www.faceit.com/de/players/KiirbyxDgL
I am able to log me in and all that, but I wanted to register this account for CS:GO too.
The problem is, is that CS:GO is registered to another account which I have not the name, email or similar information. So which my question is: Can you delete my SteamID for the CS:GO game, so I can register my account (https://www.faceit.com/de/players/KiirbyxDgL) for CS:GO ? I have tried it by myself and I became this error :
„It looks like the account you're trying to connect is already connected to another FACEIT user.“

So regarding my account (https://www.faceit.com/de/players/KiirbyxDgL): It’s alright. I have access to it & I know the Email from this account. But the account where CS:GO is registered with my SteamID is unknown to me.

I can provide you with every info regarding my Faceit account, which I have connected with my KiirbyxDgL account. But I cannot get any pieces of information regarding my Faceit CS:GO account. My CS:GO and Rocket League are on the same steam profile!
https://steamcommunity.com/id/kiirbydgl/

| steamname: KiirbyDgL 'ツ
| steam3ID: [U:1:253423827]
| steamID32: STEAM_0:1:126711913
| steamID64: https://steamcommunity.com/profiles/76561198213689555
| customURL: https://steamcommunity.com/id/kiirbydgl

Best regards,
KiirbyDgL / Tim Achenbach