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Call your state's insurance commissioner's office. I'm not sure if they can help, but you have nothing to lose either. I think you may have a good case at least for arbitration.
I hope your recovery is proceeding well.
I plan on that avenue after i exhaust all others.
Recovery is complete. 100% cleared for all activity. I over healed ( my tendon is now 2x the original size/ left foot achilles ) So im thankful for that for sure.