National Shopping Service NSS Still Owes Me Money California

I worked with NSS for about 4 years. I did hundredd of shops, literally about 204. This kills me, but i really want my money. After the owner died, things were business as usual for a bit, but then the checkes stopped. But being that i had so much faith in them, i kept shopping. Checks come pate, it happens. But I am still owed 700 bucks. I did the math. And they were paid thru the company i shopped, becuse i called them and the man wh wrote the checks told me the date they were paid. They closed the doors, and no one got paid. I still have all of the everything.

Any suggestions? its been almost a year.