I am so sorry to hear that this happened to you.  It's very hard to lose business to someone who is only offering your clients a lower price.    There's really no recourse either.  Your client is probably looking to cut costs wherever they can; the abstract company sounds like they perpetually troll for new clients & you are stuck between a rock and a hard place.  Something like this has happened to me a while ago & it was awful.    I wish I could say something to make you feel better but I don't think that mere words will do it.  One of the ongoing problems in this industry is that  years ago there were very few large title companies & most of the examiners knew each other & respected each other's boundaries.  Not the same at all anymore. 

I hope that you will survive this & that with Spring coming some more work will come your way.

Take care.