Lenovo Y500 — graphic card related

i hv lenovo y500 machine it has PCI-E slot graphic card that means that the graphic card is not on mother board and can be upgraded but when i called the lenovo support numbers they told my laptop is having graphic card onboard . so why do they mislead their consumers telling PCI-E SLOT DISCRETE GRAPHIC CARD, im really suffering due to this, t should be taken care of