1. First of all, you can contact the loan company through the contact information provided by the loan company and ask about the mailing of bank cards. You can provide your name, ID number and loan contract number to the loan company so that they can verify their identity.

2. Secondly, if the loan company can't provide a satisfactory answer or can't contact the loan company itself, it can consider seeking help from the local consumer protection agency or bank supervision agency. These institutions usually provide relevant complaint channels and solutions.

Finally, if you think that the behavior of the loan company has violated the contract or legal provisions, you can seek legal help. You can consult a lawyer or bring a lawsuit to the court to safeguard your legitimate rights and interests.