And here's the email I got today lol:
"I see we have declined previous requests to re-enable this account. After careful review, I’ve determined that we’re unable to take further action regarding this matter. Please consider this the end of correspondence regarding your ads account."
That means you need to keep emailing them. Demand that they explain to you WHY you got banned, and what clause in the FB terms and conditions you're in violation of.
Be firm, but polite. Do not threaten them with a lawsuit; they will not take you seriously if you do that.
Do this for 1 to 2 more weeks. If it fails, then it's time to retain a California lawyer that sends them a certified nastygram demanding that they 1) explain why you got shit canned and exactly what clause in the Facebook terms and conditions you violated 2) request that the account be reinstated if no reasonable explanation can be given OR request that the account be reinstated once the terms of service violation is corrected.
You're looking at paying around ~500 bucks or so for the lawyer letter.
Although this didn't happen to me with facebook, the above strategy paid off with Google Adwords back in October 2013. They kept giving me the run around for 3 weeks via email before they finally told me what rule I was in violation for (It was the Bridge Page rule FYI). I corrected the mistake and then they reinstated the account.
I was also told by Google Adwords that my Adwords account could not be reinstated and I can not appeal the decision, but I pressed on and someone who wasn't some idiot drone finally listened.