Maybe it is a false ban, just wait it out, I believe your story.

引用自 Stalin：

First, I wanted to say that I use Google Translate, so I apologize if my words seem strange.

So, my account was permanently banned for using cheats, and it says I can't negotiate. But first, I want to say that the person who used it wasn't me, but someone else. Why is that? My account was hacked a few days ago, so I can't use or play it. I also rarely open Steam, so the hacker has probably been messing with the games on my account for almost a week. I also have proof from when I appealed to Steam support regarding my account ban. The main question is, can my account be unbanned? And where should I file an appeal regarding this account issue?

Have you been banned in CS2?

I was not using my account when it was game banned. Can the ban be removed?

No. Regardless of who was using the account at the time the ban was issued, game bans are permanent and are not removed.

From: CS2 - I've been game banned FAQ

引用自 Stalin：

First, I wanted to say that I use Google Translate, so I apologize if my words seem strange.

So, my account was permanently banned for using cheats, and it says I can't negotiate. But first, I want to say that the person who used it wasn't me, but someone else. Why is that? My account was hacked a few days ago, so I can't use or play it. I also rarely open Steam, so the hacker has probably been messing with the games on my account for almost a week. I also have proof from when I appealed to Steam support regarding my account ban. The main question is, can my account be unbanned? And where should I file an appeal regarding this account issue?

1 game ban on record | Info
2 day(s) since last ban

Irrelevant who used the account, the account was caught breaking the rules. There are a few reasons for a gameban, also its irrelevant what it says ingame. Now steam support will just give you the gameban info once and after that straight up ignore you. If its for any other games what is not Valve games then they give you the necessary steps to do. Best to go to your profile and click on the info button next to your gameban

gameban cs2 - https://psteamhelp.yuanyoumao.com/en/faqs/view/4E54-0B96-D0A4-1557

Can I appeal my game ban?
No. Game bans cannot be appealed and are not removed from accounts.

I was not using my account when it was game banned. Can the ban be removed?
No. Regardless of who was using the account at the time the ban was issued, game bans are permanent and are not removed.

gameban by developer - https://psteamhelp.yuanyoumao.com/en/faqs/view/46DB-4CEC-F7E9-49E5