Deportation issue

I want to find out something regarding deportation. I was deported from Germany. I got a Schengen visa through Italy on a tourist visa. After which I received Asylum in Germany for about 3 years, after that, I was deported to Nigeria. But what happened was that in the process, I changed my name and date of birth because of fear of deportation. But changing the name was the biggest mistake I made because I was told to do that by my brothers, who are in Germany. They gave me 30 months. The barn of entry, which ended 2 years ago. I want to know the implications and the possible means of solving this problem. I did it unknowingly is something I did not know the implications of. Please, what do I do to resolve this? i have written a letter to the German authority, but since then no answer.