Discovery Chronic are *********** and don't care

When suffering from chronic conditions, one does not expect to endure months of stress for Discovery Health to cover their obligations. I have an outstanding account since April with Lancet Laboratories for blood tests that Discovery Chronic has agreed to pay. But Discovery Claims keep rejecting it, even though their Chronic Department agrees it is covered. Lancet has handed the account over to a collections agency and I am being harassed. I have logged multiple calls with Discovery, and spoken to several agents in the Chronic Department who assure me it will be sorted. But I never hear from them again - just get a new rejected claim.