Sounds like the "woman I spoke with at 1-800-NISSAN-1" was at a call center reading from a script. At the very least, she should directed you to the proper website for further info.
Service Plans at a Glance
Security+Plus® Vehicle Service Contracts (VSC)
The best mechanical protection for your Nissan. Security+Plus Vehicle Protection Plans are designed for Nissan owners and backed by Nissan. Factory-trained technicians will repair your new or pre-owned Nissan, ensuring the best possible service. Nationwide coverage is provided with three plans to choose from, with coverage up to 8 years and 120,000 miles, and the option of a $0 or $100 deductible. Download:
https://owners.nissanusa.com/content/te ... tended.pdf
QualityGuard+Plus® Extended Protection Plans
Designed for non-Nissan new and pre-owned vehicles. These policies offer mechanical protection for the most critical vehicle components for up to 7 years and 100,000 miles from the time you purchase your plan with three levels of coverage. For your convenience, repairs can be performed at any authorized repair facility nationwide. Download:
https://owners.nissanusa.com/content/te ... yGuard.pdf
Service Plan FAQ
https://owners.nissanusa.com/nowners/navigation/faq