Unprofessional Treatment

I received a call from Discovery Health after I app**** to add a dependent (My grandson) on my medical aid, My daughter was removed from the medical aid because of her age, she is unemployed and has a child who is 3months old. On the 08/7/20@17:23 I received a call from Discovery telling me that I am not allowed to have my grandson as a dependent on my medical aid because he is not my son I must get a letter from the court and if I don't have that letter I must join a separate medical aid for him. My first question was how do I get that letter and the guy said he doesn't know and that at Discovery they just require it. My second question was which plan must I take and he said he didn't know which on, I asked him if I should pay for 2 Discovery medical aid then he hang up.