... did you call someone when you set that TV up?
That was not an idle question. If you can remember back to when you set up your Roku...
Did your initial attempt to enter the link code fail and were you then directed to go to a different "support" website or call a "support" phone number? If so you didn't get to the actual my.roku.com site to link your Roku but instead got to a fake Roku site run by a scammer. Many of them will charge a registration fee (something Roku does not do) but even if they don't they've now got your email and payment information. In most cases the user is none the wiser because the scammer can set the user up with a working account. Watch your charges like a hawk because the scammer can now place any charges to your payment account he wishes, and call them anything he wants so you can't assume any charges saying they're from Roku really ARE from Roku. Challenge any unrecognized charges with the financial institution reporting these charges, as they can track them back to their actual origin.
In this case it sounds like the scammer had enough info to log into your Roku account and change the email address attached to the account so that you can no longer log in to manage your account.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X