sign to be a Uber Courier in German

I am stuck at the last few steps of the registration and the customer service can’t provide me with any help, for example, I now need to submit an EC-Card / Kontoauszug / Bankdokument，But I have submitted photos of bank transfers and cards many times，I can only get the following reply every time. Even when I ask the customer service, they cannot tell me what is wrong. The photo I provided has my name iban and bic on it. What exactly does he want me to submit?and i also can’t contact with fleet partner,Because there is no contact information🌚🌚