Debiting higher premium

When I joined Discovery in March they gave me a 3 month free subscription to Vitality and said someone will contact me to confirm after 3 months if im still interested I have cancelled the medical aid and they have charged me R290 extra for this when I did not sign up or agree to this Please return my money this is the reason I looked for alternative medical aid. They confirmed R1400 will run off and took R290 extra without authorization. I want the refund asap.card number ***