Under "Email subscriptions" in my HHonors profile I have:

HILTON GRAND VACATIONS MARKETING

I agree to receive marketing messages and promotional offers from Hilton Grand Vacations ("HGV"), our third-party partner, via email, direct mail and via telephone, as described in HGV's Privacy Statement The privacy statement link will open in a new tab.I understand that I can withdraw from HGV's contact list at any time by following instructions HGV provides in each marketing message.

Have you tried unticking the box?