I don't think he is lazy. Australia is 18 hours ahead of California i think, so that could be the reason. Plus, the US toll free number might not be free for him. Either way MSA should response to his emails. The company I work for we respond to each and every email within 24 hours. Thats called Customer Service.
mossy74, don't use one of those free email accounts to send them an email. Use your work account to send them an email and see if you get a response thus eliminating SPAM filtering.