Dispute of a valid claim by SANLAM SKY

I took a policy with Sanlam June and added my siblings, and they made a mistake while adding my big brother, I did call to enquire about that and they managed to change to the right details. What surprises me when I claimed for my brother, the reply came as the person is not insured, little they didn't know that I have the Policy Schedule and they decided to remove my brother. And the premiums they also dropped because of the removal they made. I will never trust Sanlam Sky anymore. I'm looking for a insurance that I can move to with my family with the same cover amount.