Discovery unsuccessful claims end of life care.

I have been trying to claim for end of life nursing care for my husband going on 6 months now and am not having any luck. In June of last year Discovery health approved TPN nutrition for my husband who was diagnosed with stomach cancer and had his stomach removed. The TPN is an INTRAVENOUS feed bag and needs to be administered by a nurse! We have been trying unsuccessfully for 6 months to get the nursing bill approved. We have been bounced around from pillar to post, myself, the nursing agency AND my broker. Discovery eventually approved 3 months of TPN nutrition bags again...AFTER my husband had been deceased for a month!