Faulty tv

On the 19/10/2016 I recieved a new TV set from Russells as a replacement for my ****** tv as it was still insured .The tv goes black and I took it back to Russells on the 20/01/2018 as I assume that it has a 2 year warranty.I was informed by the shop manager that they count the warranty from the 1st tv set which I do not agree with