I just saw this message while looking for support on this theme, I do not work for ProDesigns.
In regards to the blackspace, It is possible that the blackspace is due to you not having content in the footer widgets? or you have removed the details from the footer widgets rather than removing the widgets altogether?
You can check this by going to ‘Appearance > Widgets’ and looking at your Footer 1,2,3,4 areas.
Also you could add the below code to your Appearance > Customise > Additional CSS
This will hide the extended footer-widgets altogether.