Google contact: apps vs IPv6 issue

Hello! Could someone advice a good contact inside Google? I'm operating a IPv6 tunnel broker http://tb.netassist.ua/ Now there are a number of complaints tunnel broker users can't access Google Apps with the reason "We're sorry, but this service is not available in your country". IPv4 access to same pages from Ukraine is OK, and MaxMind GeoIP replies our IPv6 network we are using in our service is "NetAssist, Ukraine".