My dad and everybody else in my family holds dual citizenship with Poland and Germany. My mom only has Polish citizenship,
You have enough to become Polish citizen and provided with the Polish passport. (PESEL is relevant while getting passport)
I am in very same situation as you are. Your mother Birth Certificate should be sufficient, as it was in my case.
For some reason however, I'm not granted citizenship until I "proof" that my ancestors 3 generations back are Polish and I have to write about what they did in their lives. These go back to the 19th century,
Never heard of such law/requirements. Unless the politicians in PL flipped.
Change the Consulate, ask to be seen by vice-consul. (you have the right for such request) And arm yourself with Polish Birth Certificates.