Questions about debt collection by a debt collection company

For a loan allegedly received in 2017 from Creditmarket. I did not sign or receive the contract with the collection company. I learned about the case from the bailiff. The case was considered in court without my presence. More than 50,000 hryvnias were billed, but they say that I received a loan in the amount of 20,000 hryvnias. The credit passport provides for the transfer of funds to a bank card. No one transferred the money to me. However, the salary card has now been seized. I unlocked UAH 13,400 per month. What should be my next steps? The lawyer I hired says that I would have to prove that I did not receive funds on the bank card in 2017. How can I prove it?