Claim amount on legal malpractice

Asked in San Ramon, CA - almost 3 years

I borrowed $400,000 from my parents to make an investment. The investment company committed fraud and the investment went under, all the money was gone. I hired a large law firm to file a claim for the $400K , which they did . After a few years the case was dismissed, lack of evendince which the law firm failed to do discovery of key evidence, then judge said it was toolate and was not admissable. My parents asked me to pay them back only $100K, which I have done. I talked to an attorney referred to me, but he says my claim against the law firm is for only $100K , not the full $400K, saying that it is the amount of my actual damges. is this right..doesn't seem right to me? thank you-