I own an old Roku SD. I was setting it up in my garage, only to find out that it will no longer work with channel store. The device is definitely linked to my account, yet when I go to roku.com/upgrade, I do not see the $15 offer to buy a roku express+ that was displaying on my roku sd. The offer said it expires later in January 2020,I wanted to take advantage now. But, I see no way to exercise the offer and no one to contact.