*All* the work? *All* the forms? Did your current attorney say the prior attorney committed malpractice?
You have given no facts to even guess if there was malpractice, or even a potential malpractice case.
As HomeGuru said, ask. Those that don't ask, don't get. If he refuses, take the actual facts to an attorney for review.
When you are a Bear of Very Little Brain, and you Think of Things, you find sometimes that a Thing which seemed very Thingish inside you is quite different when it gets out into the open and has other people looking at it.
--W. T. Pooh (aka A. A. Milne)