Belive it or not each region (there are 24 regions) of junior college are able to set some of their own rules always withing the rules set by the national organization.
If you are a college coach, your job is to know the rules you need to operate your recruiting practices on and while their are some dumb coaches out there, most know and adhere to the rules or else they can get in trouble and they don't want to do that.
With that being said, I would imagine the contact was within the rules and the only thing that would lead me to believe that it wasn't is if the coach thought your high school graduation date was a different date as that sometimes happens at the NCAA level. But I doubt that was the case. I can't find any rules either which leads me to believe they might not have one.
This problem could be solved by simply calling or emailing the coach and asking.
Dave G
Varsityedge.com