Internal administrative error is placing a financial burden on its members

Discovery health has acknowledged a claims processing error on their system for the period of January-December 2025, which resulted in incorrect benefit allocations. After retrospectively reprocessing claims nearly a year later, Discovery now alleges that I owe a substantial amount in 'overpaid' benefits. I am being asked to repay this amount despite the error being entirely on Discovery's side, with no reimbur*****t offered for the claims declined due to the same mistake.