My question involves criminal law for the state of: California

I got a DUI in Oct 1996, it was my 2nd. As a punishment to myself, I decided not to drive for 10 years. Now I am having trouble getting my license back. I completed everything, fines, classes, etc.

I completed the 18 month course, but now the DMV has no record of it and the place I took the classes at only have records going back 10 years. I have moved a few times and lost my copies. So far, I have been told I was out of luck and needed to take the 18 month course again. I am posting here as a last resort. Does anyone have any ideas?