thank you for waiting and I am sorry we could not get bcak to you any sooner, but I was on sick-leave therefore could not respond timely.
As for your question:
1. It is not unsual that one has to wait 2-3 months, but 6 months is quite a long time. You might wanna address the foreign office either in person or as you have lawyer through a lawyer, giving them a deadline.
2. If you have filed an appeal- you do not loose the Aufenthaltstitel you have been granted- however during the process of appeal certain rights that come with granted Status might be delayed/hold back. If you have gone in appeal that could be a reason why you have not received anything since 02/2018.
I hope I could address your questions and if there any further questions please do not hesitate to use our platform and contribute to the community.