About the next operation of American immigrant I824 (focus on joining)

I'm pretty sure something is wrong. Either your materials are lost or your father's lawyer is lying. So please ask your father to put a little pressure on the lawyer to solve this problem.

By the way, I will give you a website, you can check it yourself:

https://infopass.uscis.gov/info_ch.php

or

https://egov.uscis.gov/cris/caseStatusSearchDisplay.do; jsessionid = cabaamqsvre 9 b-mtqfl 4 r