When I signed up for my subscription I also never heard back from them (except the initial automatic email that confirmed my subscription). However, some month later the first issue showed up in my mailbox. Your subscription may start with the next issue as it was too late for the last one.
When asked about the missing subscription at their booth at Heli Expo in Houston a young blond girl (I believe she was Ned's daughter) told me they had some problems with the company that handled the subscriptions, but they were about to restructure and take over by themselves or something along those lines.
When I changed my address, they were very quick to respond and update though.