Thank you all for your responses!
I totally understand that all the transactions are irreversible on the blockchain, and obviously the hacker will never return the funds.
I'm quite sure i downloaded the official apps, both the deskopt one and the android one. And i only use this wallet on Binance DEX.
The 12 seed phrase i wrote it on a papper, away from online vulnerabilities. So it's impossible for someone to find it out.
I know what 2FA is. I used it everywhere it is available (Binance, Crypto.com, Bittrex). Unfortunately Atomic Wallet doesn't have 2FA.

The weird thing is that the support team from Atomic Wallet told me that is normal to have 2 different passwords for the same account. That's a bit strange for me. What do you guys thing about that?

My lose was about 600 USD.