After 10 years of employment and a flawless record, I have been laid off while I am on maternity leave. I went out of work at 6 months pregnant due to back pain. In my last month of pregnancy, I got a call letting me know that the entire department was laid off and I was going to be when I returned from maternity leave. However as time has passed, this is not actually the case. There are 11 people who are staying to manage the department and one of the people staying is in my office performing my job duties but at a lower title (manager). I am still on maternity leave so I am not officially laid off until I "return" from maternity leave however I am told I will be. My personal items have all been packed up and my phone has been disconnected at the office. My HR department had also "miscalculated" my severance leaving me short 10 weeks that I was owed. I pressed them on several occasions to inform me how my severance was calculated and only when I demanded, did they concede that they made a mistake. I feel that my job is discriminating against me because I was out on maternity leave. Is there a rule that if you go out on disability that they have to have your job waiting for you upon return?

I live in California.