From past experience unless your email is directed at someone specific at surefire (and sometimes even then) you can expect a long wait for a reply.
By far from my experience it's best to call their customer service on the phone.
That said, anyone that's ever taken a customer service class or Internet Business class, knows that if you can't respond to a customer's email in 48 hours max on average, you shouldn't have a customer service email because it becomes a negative that frustrates the customer. Better to just have a phone number for them to call. Surefire is by far not the only company to have problems with this.
Todd