Claims do not get paid even when inline with PMB conditions

Bonitas owes my service provider R194941.88 in unpaid medical bills! they make you phone, email, amend invoices jump though hoops and all they do is say we are busy reprocessing. Only to Reject once again . All auth codes/ ICD10 codes/ Tariff rates are correct, Resubmission done intime. Patient is Chronic PMB condition yet two years later we must still fight for payments. I have emailed countless people and at first the person managing my query was responding, now my emails fall on death ears with still Zero payments made to the service provider.