Discovery Key Care Plus

I have been "begging" discovery to assist me with paying for treatement as i am starting to lose feeling in my upper thigh and it is due to lower back disc degeneration, even after telling them it is affecting my everyday life they still dont want to approve MRI and Treatment. So for not being able to afford a Top of the range plan i must stay in pain and not have any relieve even with pain medication, i drink pain tablets to assist with sleeping. I am a single parent and having my daughters father passing away 2 years ago i cannot afford a better medical aid at the moment, the dont cover the treatment i need but what happens when i lose total use of my leg will they then wake up in assisting or are the still gonna refuse help