Lawyer A filed a lawsuit against my exhusband on my behalf, and then ignored communication from my ex's attorney stating they would sue US for a frivolous lawsuit if we continued; two weeks later Lawyer A dropped me as a client (she said she was too sick to continue her practice, although as of yesterday, she was still accepting new clients), and allegedly gave my case to Lawyer B. Four months passed, and Lawyer B claims that he was never made the attorney of record on my case, and in that time, my ex filed a motion for summary judgment. ALL of the documents went to Lawyer A (someone in her office signed for them), and she never informed Lawyer B that there was such a motion. Lawyer B became the attorney of record 10 days before the case went before the judge, but claims he was unaware that the motion was ever filed, so he did not represent me at it. The MSJ was granted to my ex, and I found out all of this over a month later. Do I have any recourse here? Who is at fault here? Lawyer A or Lawyer B or both?

Incidentally, Lawyer B claims I owe him $2000 for the "preliminary work" he's already done (he read through the case file), and wants a $3000 retainer in addition if I want him to handle the current mess.