Why refuse to let us cancel our Vitality??

I sent an email beginning of December 2019 to cancel my vitality as I didn't want to be charged,I was charged anyway. I disputed the debit order with my bank and tried to call the call center but I was kept on hold until my lunch ended. I sent several more emails because I didn't want to be charged this month but now my app is telling me they have taken out R649 from my card. I have about 5-6 emails to Discovery wanting to cancel,I even have a reference number and was told someone would get back to me- no one did. I want my money back and I want to cancel this membership because I told them I don't use the service. This is appalling and I am going to change my medical aid soon.