221 g status

I had my visa interview on April, 2016. They provided a blue slip and asked my petitioner to provide few documents. These were sent to the consulate and we got an acknowledgement as well.
But till date we havent heard from them. They say the visa is under administrative process and they can’t assess the time line.

Is there a way to get a proper response from them.
Is there a chance for my visa to be approved, after an year and half