Extended Warranty is Nonsense

On the 26/05/2013 i purchased a 55 inch Hisense and a 32 inch JVC. When i purchased the tv's the lady who was selling the extended warranty told me that i should take the extended warranty because if the tv should ever pixelate they would replace the tv and not repair it. So i though it would be a good idea and took the warranty. The 32 JVC now has a thin white line. I took it into the store 7/6/2015 the service department had a look and saw the line and said they would replace it. Then they said i could take another tv for the same value or pay the difference if i took one that was more than the original purchase price. Then all of a sudden they changed the story and said that they didnt notice that the tv was bought in 2013 they thought that it was bought in 2015 and this is after looking at the receipt for over 20 minutes. Now they say that they cant replace the tv it has to go in for repairs. I informed them that that is not what they originally told me and not what the lady who sold me the extended warranty said. It is unacceptable that they speak lies to sell extended warranties and then cant even honour their service agreement of replacement tv due to pixelation. Pathetic