I've worked with ACL since 2008. My experience has been that they will bend over backwards to keep from rejecting a shop without reason. At times, even if the editor feels that you didn't follow the guidelines, they will forward the report to the client and let the client decide.
Be sure to closely read the questionnaire before performing the shop ALSO clarify any questions ahead of time via email. This cuts down on 95% of the issues that will cause a shop to be rejected. Occasionally there will be discrepancies between the first page guidelines and the general PDF file of guidelines. One set will supersede the other - be sure you know which one overrides the other.
I'm sorry your shop was rejected. If you have all of the facts straight, you can plead your cases by phone or email. They are a friendly bunch to work with. However, don't waste the time if you didn't follow the guidelines to the t, regardless of the shop being a carryout vs sit down.