Discovery don't care for the elderly who have paid their membership for years

My parents have been on Discovery for 30+ years. My dad has suffered with bladder and prostate cancer and had many procedures which has resulted in him having a very weak bladder which requires the use of adult diapers. Despite the urologist motivating and completing forms for diapers to be covered under the Chronic Illness Benefit, Discovery has rejected this. My parents are pensioners who cannot afford the cost of these diapers as 5 x are used per day. I logged queries for the CIB benefit with Discovery as per reference numbers ***, ***, ***, in May and June and never got a response, so I had to call in, only to be told of the rejection (I have been granted authority over their medical issues). I requested this be escalated to management as per reference ***. I think this is unacceptable. Why must my dad suffer because he can't afford to buy the amount of diapers he needs? He can't even go anywhere because he wets his pants and gets embarrassed. Is this qualify of life, no! I certainly can't afford them either. Discovery has programmes for this for mothers with babies who can get diapers cheaply, but not for the elderly? And this is related to the chronic benefit for his cancer! Discovery will cover medication for chronic conditions why not this? Beyond disgusting and absolutely pathetic.