Roku tv was turned off by phone saleman. He informed me that i have to pay roku to use tv operat
I was sent a email saying i had to pay 49.99 for a year of Roku service. When i told him it was free, he turned my tv off. Now it is stuck in guest mode and nothing i can do about it.
What you experienced is a known reported scam, especially placing user devices into guest mode. Usually that means the affected user somehow contacted them during the setup of the Roku device and they actually created the account so they had access.
Try performing a Factory Reset on the RokuTV. Press and hold the reset button (15-30 seconds for RokuTV) and see if that gets you to the setup screen. If so, use a completrely different email address than before and carefully follow instructions during setup. Do not contact or let anyone else setup your Roku.
As you stated, Roku is free. There is no monthly charge, and no activation fee.
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Alternatively, if you can still get into your online dashboard at https://www.roku.com/, you can try unlinking the RokuTV from the existing account. This should make it even easier to setup.