Netflix decucted money from my account without my concern

I cancelled my account in August. So yesterday as I was checking my account balance, I notice R199 was missing, opened my tyme bank app and I see netflix deducted R199 from my account. Try to log in from my Netflix account, it says incorrect email address. I called them and I was told someone change my email details and they are sorry and I will get my money back. How can someone deduct money in my account without my concern, meaning our personal details are not safe.