Let's stick to civil law. You made an oral contract, which most certainly may be enforceable but more difficult to prove. The fact that you accepted all the items for delivery places the burden of proof on you that you didn't accept the agreement. Your willful acceptance and taking possession of the items would seem to seal the deal. And they can and probably will come after you if you don't fulfill your end of the agreement.

Now let's say you didn't want to sign the contract and the vendor agrees that there shouldn't be any binding contract.. Clearly the items are not yours and everything, including the TV, goes back to the vendor. It wasn't a gift. So we're right back to where we were before. Is there an open issue?