Discovery selling personal details

If anyone considerers using Discovery Insure , please be aware that they sell your personal information . I used to be a client , until i left them , and moved to Santam . Next moment , i got a call from Matrix , where the sales agent told me he got my details from Discovery . That call was recorded . Now , discovery responded to my first complain , but said that Matrix is wrong ,and that they would give out my details . But they refrain to answer on how Matrix knew I was a client? I need to know who my attorney can contact as I am tired of this now .