Legal Question in Employment Law in California

Unless you failed to mention something of significance there should be a binding contract of employment as you accepted their offer and they confirmed the agreement. The issue will be what your damages are -- what you would have earned with them versus what you are earning , when they could have terminated your employment, difference in cost of living there and where ever you get a job, but savings of no moving costs. But you can not force an honest answer from them -- they are not going to tell you anything that reflects badly on them.