They gave me data on December 2024 without getting my authority after that by January 2025 they close my phone and still now is not working

They gave me data on December 2024 without getting my authority after that by January 2025 they close my phone and still now is not working. Whenever I talk to them they tell me to pay the money of which I don't know. Now my credit score is down because of them and I swear I didn't sign any contract with them