Riot Restricted My Recovered League of Legends Account

I had my League of Legends account, where I’ve spent a significant amount of money, stolen. Fortunately, I was able to recover and secure it. However, the next day, I received an email from Riot stating that my account had been restricted for security reasons, and I lost access again.

Riot then asked for account details to verify my ownership. While I answered most questions, some details were left blank because I have multiple accounts, and this one is older than the others, so I couldn’t remember everything. Despite providing much of the requested information, I was told I wouldn’t be getting my account back. I find this decision by Riot Games to be completely unfair, and I demand the immediate return of my account.