Google AdSense, is undoubtedly, one of the most preferred source of income for most of the Bloggers. It's from Google, and it's easy to use, you keep the ad codes, people visit/click, you earn money, this is completely automated, you don't need to login and do anything special every day.
Unfortunately, it's pretty easy to get banned or suspended these days. If you are following Google AdSense Program Policies, then your account should be safe and you'll get payments without any issue. But if, by any chance, if you face any issues with your account, then these are the forms that'll be helpful for you. You can open the link and know more about the purpose.
1) Reporting a Violation
2) Policy violation appeal - account disabled
3) Invalid activity appeal
Have you used any other AdSense forms? Do share with us, we'll update this post.