Lost files on corrupt disc

I have a mini DVD-R disc with my wedding video and I’m unable to open it. I don’t know if I did something during the finalization of the disc but I’m able to retrieve the other data from the other 2 discs. The disc is memorex and I used isobuster and was able to retreive some files in tao form but wasn’t able to use it as mpeg form to edit with the other video files. I’m desperate to figure this out. Is there someplace I could send the disc to have it duplicated to a disc I can use or is there some software to help solve my problems…please help!