Commercial Appraisal Question

[Elisa Pinigis]

The appraisal district increased our property by approximately $500k / 58% in 2018 without any corresponding changes to the property or neighborhood. Our protest firm failed to attend the informal and formal hearings. We are heading to arbitration on our own because it isn't cost effective to hire an attorney. We submitted evidence that would reduce our appraisal. The appraisal district responded by adding some factor to its original 2018 comps that brought the cost per sq. ft. from $156/sq. ft. to $217.89 / sq. ft. The revised figures are illegible and not accompanied by an explanation. Do we have any recourse?