Hi, I am sorry to hear you are having issues with Netflix. Unfortunately, you would have to contact the developers of the Netflix app to resolve issues regarding payment and offered services, as Samsung does not manage payments or services for them. I apologize for the inconvenience.
However, on the hacking problem, if you’re worried about your phone getting hacked, or if you think it may have been hacked already, there are some steps you can take to keep it safe. For example, you should only download apps using the Galaxy Store or Play Store and you shouldn’t click on malicious links in apps, texts, or emails. You can also keep your phone safe by running anti-malware apps and removing apps that are causing issues. Try these troubleshooting steps: https://www.samsung.com/us/support/troubleshooting/TSG01209886/
Please inform me if this helps.