I have had troubles getting them on the phone, but they have been responding to e-mails within 24 hours. My guess is as Mofi suggests, the Axpona show has them a bit back logged. I know they were late getting my new pulley out to me. In fact, I'm still waiting for it as I write this.
It can be frustrating, but it's part of the business. I've had slow service issues with other manufacturers around show times too.