It could be the rhetoric that was in the body of your email made in undesirable to answer.
Maybe u used wrong email or phone number. Google
Also, make sure you have the subject line filled out. This will help it get to the right department.
Because they are a large corporation, who more than likely has an automated email response system. This system may be unable to answer your questions. Also, check your drafts and sent mail to ensure it was sent. If it was sent and there has been no response, give them a call.
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