@ikizilhan
Sorry to hear about your recent experience. Here are the possible reasons:
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You shared your 12 words (via phishing, social engineering, etc.);
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You saved your 12 words in a very bad place;
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Your device is corrupted with malware;
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Someone had physical access to your device;
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You entered your recovery phrase on a fake/clone app.
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You transacted with a malicious DApp.
There is no way for us to reverse transactions once they have been confirmed.
The app does not require 2FA because that defeats the purpose for a decentralized wallet.
Please read and understand this:
Learn more about how to protect your cryptos and new wallet:
We are sorry for your loss.