Discovery never cease to underpay

I have a specific chronic medication prescribed by my Neurologist (17 years ago) a derivative of one on Discovery's prescribed drug list - they approved the appeal for the specific medication for the rest of my life. All went well and I could claim from my chronic benefit (I am on their second best plan) - UNTIL now they are *****ing me from another end...They are forcing the pharmacies to comply to their generic list otherwise they take their stamp of approval from the pharmacy. Now the pharmacy do not want to dispense my medication because Discovery is penalising them for not staying within their "points" margin - who suffers? Me! The pharmacy do not want to dispense my 'approved' meds because they have to take the brunt for it - because with Discovery there are no exceptions...where am I supposed to get my medication?