First, verify that your account is actually eligible for the Scroll of Resurrection program. To qualify, your World of Warcraft license must be a) merged with a wow po Battle.net account, b) in good standing (not banned or locked), and c) inactive as of or before March 4, 2012.
Second, you'll want to make sure that your friend or family member sent the Scroll of Resurrection invitation to the correct Battle.net email address. If the invitation was accidentally sent to the wrong address, simply have your friend/family member resend the invitation at their next earliest convenience.
If you've verified that your World of Warcraft license is eligible for resurrection and that the invitation is being sent to the correct address, be sure to check your Spam and Junk email folders. The invitation may have been accidentally filtered to one of these locations.