A game based entirely on fraud.

Heya,

First off, these kind of issues cannot be assisted with on the forums, only the TOS team is able to do anything related to account actions.

Assuming the ban is indeed for cheating, they would not be able to give exact proof of this.
Showing specifics such as "Wallhacking" or spotted cheating on x date would make it easier for Cheat developers to figure out what caused the detection, allowing to circumvent it further.

If you did not cheat then it's possible your account was compromised. You can check all successful logged in devices on this page: https://myaccount.ea.com/cp-ui/security/index

I'd recommend to check if there aren't any logins that weren't done by you.
If you were compromised, work on re-securing the account first:
[EA Help] What to do if your EA Account has been hacked 

Additionally, here are some articles to help you re-secure your platform accounts:

• [Steam] Recovering a Stolen or Hijacked Steam Account 
•  [Microsoft, Xbox] Secure your account if you think you’ve been hacked 
• [Playstation] Phished (compromised) accounts and unauthorized charges 
• [Nintendo] Nintendo Account Recovery Process

Once you've re-secured your account, you can try disputing your ban again, might help to indicate that your account was compromised (if it was)

Keep in mind that you can dispute your ban up to 3 times, any more disputes will likely be ignored.