US Immigration from Croatia

Hi There,

This is in regards to my I485 petition. I had to reschedule the biometrics appointment because I could not make it on time and date initially suggested by USCIS. I send back the I-797C with request to reschedule. The initial appointment was set up for 8/14/20 but I still haven't heard back with the new appointment time and date. Any suggestions on what I should do? I tried calling but it's impossible to get a human person on the phone. Thanks!