My lcd is only 9 months old but has broke, argos has said they cant replace it!!?

my tv is broke and argos have said they dont stock it anymore!! so cant replace it, they have said they will give me argos vouchers but if they do that i wont be able afford another tv with them has the cheapest tv i will have to put 150 towards it as i bought this tv in the sale. have i got rights to ask them to replace it