Consent not given for Vitality to be added

Last year I got a call from one their representatives offering the Vitality product. I refused to add it to my medical aid, and she kept on pushing. She suggested that I take a 3-month trial just to see how it works and to also see if I'd like those benefits. I agreed to the trial but not for Vitality to be added to my medical. She made it sound like we'd have a conversation again after the 3 months free trial. Next thing I know Vitality is added to my medical aid and the premiums are being debited. I called in early this year Feb/March and spoke to guy called Lifa Grootboom who referred me to Remona. Remona promised to listen to my call and send it to me. It's been almost 5 months of me following up with her. The one time I was told by another manager named Bianca, that Remona had emailed the recorded call to me. I told her its not in my inbox and that I want my refund. She said she'd ask Remona to give me a call the following and to date i haven't received anything. Not the callback, not the recorded call and certainly not my refund. The call with Bianca was a month ago. I want Discovery to refund my money because i didn't give consent for Vitality to be added.