Lynn,
I had this happen to me just a few months ago. This wasn't my only source of income but it was through a private insurance company with my last full-time employer before going on disability.
I had been receiving benefits from them for 8 years and they pulled the plug all at once. I called them and had to send them all my pay stubs, W-2 forms and a pay history from my current employer.
Once they reviewed my work and pay history they re-instated my benefits and paid back what they took. It took 3 months but I did get it started again.
I wish you the best with this and hope it gets straightened out quickly.
Babs