Hey there,
If you haven't recently used your account and you're finding it's been banned, it's likely that someone else gained access to the account and was up to no good with it. In those cases we would ban the account to stop that activity until we can be sure the proper account owner has control again.
Please be sure you've secured your account and then take a look through the link below to reach out to an advisor. They'll be able to look into getting this fixed up for you, thanks!
https://help.ea.com/en-us/help/account/information-about-banned-or-suspended-accounts/