I didn't get anywhere by complaining to EA themselves, just kept getting Automated responses. 

They tried to dress them up as unique responses, but looking through complaints I could see these were automated responses that they send to everyone they ban. 

I complained to Fifa via their terms of service team 4 times, and got 4 responses saying they banned me correctly over a period of 2 weeks. 

I complained to the better business bureau, and a day later someone from their head office contacted me via email. 

I was unbanned within 10 days, this took a while as quite a few people got automatically banned that week due to a SBC requirement that needed a player that costed 10k that would usually cost 1k, apparently this made their systems automatically ban people thinking they were coin distributing. 

I had 4 million coins, so it didn't make sense i would buy 10k coins but the automated terms of service replies didn't seem to understand logic. 

let me know if this helps