EA's TOS team sometimes doesn’t explain the exact reason for a ban, because revealing too much info could give hackers ideas on how to get better at cheating.
NOTE: Double-check the link and the quotes I pulled out for you. You’ll see that even after the final TOS decision, you still get one last shot by contacting EA Support.
LINK: User Agreement - Official EA Site
Quote #1 If you or someone using your EA Account violates these rules, EA may send you a warning or take action against you, including revoking access to certain or all EA Services, Content, or Entitlements, or terminating your EA Account(s) as described in Section 8.
Quote #2 If you believe that any action has been taken against your Account or device in error, please contact Customer Support at help.ea.com.