Wow, that’s seriously bad luck, I feel for you!
It sounds like you have been the victim of a theft and all they got was a faulty TV, but even so, you could well end up out of pocket.
What collection paper work did you see when the tv was collected? The courier should have had a collection note or app on their phone and should have been able to quote a reference to you. Did you get the mobile number they called you from when they said they were arriving? Even if the number was withheld, the police can request this from the phone company.
What I am struggling with is why someone would bother to go to so much effort to steal a faulty tv. There seems to be a lot to unpick here.
Maybe email to a consumer tv or radio show, as "Disabled person defrauded out of TV in sophisticated scam" would be right up their street!
Worse case is claim on your household insurance, as they may have more luck getting Samsung to cooperate than you are.