Reliance Standard witheld payments from us due to their own miscalculations

My husband has partial disability due to his stroke. He can work, thankfully, but now has limitations that he didn’t have before. We started receiving benefits on time and, at the beginning, we thought they we rather large for a partial disability. We and the human resources manager at my husband’s employer questioned the claims examiner several times about the amount. She recalculated it and assured us it was correct. About a year and half later we get a letter saying they had overpaid us by a lot and we needed to send this amount back to them in 15 days. With the help of the same HR manager we told them no. They withheld payments for over a year until they considered us “even”. Now we are starting to get payments again and, as always, they are very irregular. The thing that galls us the most is that the claims examiner, DB, never admitted her calculations had been wrong all along. She blamed the whole thing on error made at my husband’s employers. One time we didn’t get payments for several months and we called and DB said she was waiting for medical records to come from our insurer. We had no notification of this and she never called the insurer to expedite and follow up on anything. I called and got the ball rolling or I don’t think we ever would have been notified about what the delay was. They have terrible customer service and you have to be on them all the time to get anything done or explained. They put a terrible burden on people who don’t have another source of income and should be held accountable.