Just a number

When i joined Discovery i chose the keycare option as im paying it myself privately and what could afford. They told me could change option any time. I called yesterday to change my option as there are exclusions and require treatment and was politely told cant only end of year. So now I pay for 3 or 4 months more and medical aid cannot be used for whats needed. No help no assistance. I feel that discovery has become so big now that you as a member are just a number. I need the treatment so can work and keep paying medical aid. But no help or assistance suggested.