Discovery Health - Unauthorized Debit

I had recently received a call from Discovery Life for a life cover, after a few discussions i opted to take the cover, however a few days before my actually doing my bloods i deceived to hold onto until i have financially ready to take the next step, i had sent through numerous of emails advising discovery to stop my debit order however i had no reply, on the 2/6/2019 I was debited, i need someone to call me and explain the reason for this unauthorized debit from my account .......J Naidoo - ********** 747