Nice to hear from you again!
Did you get in contact with your employer to tell him about the delay? I think it might be better to communicate openly what's going on instead of risking to lose the job just because he didn't hear from you.
If Bundesagentur für Arbeit doesn't have enough information to decide on the case, and they don't get back to Ausländerbehörde within 2 weeks because of that, the work permit is going to be granted by Ausländerbehörde automatically. But I don't know in how far this applies to your case.
Source (German language): https://www.gesetze-im-internet.de/beschv_2013/__36.html
Did you already get in contact with a lawyer or a counselling center? They can take a closer look at your case and maybe contact Ausländerbehörde to put pressure on the authorities. If you tell us where you live, we can do some research and give you contact information of such organisations.