No one hacked you. The message already told you that "Adsense only allows one account per person." There's a chance that someone has the same name as you are. One of my friends tried registering adsense before, he also got the same answer as you are. What he did is add his middle name when registering to adsense and got approved right away. Alternatively, you can use your relative's name, ask their permission, and use their bank account details to receive the payment from google. Simple as that. Again, no one hacked you and the highest chance why you're getting that answer from google is that someone has the same name as you are, which again, we will be going back to what they said: "Adsense only allows one account per person."
