I dont think the HD tv i bought at Argos is HD ??

Hi .I bought a HD tv from argos over a month ago .In the book it said it is HD. It does not say on the TV or the mannual or the cd i got with it that it is ? I got in touch with Argos via email , they replyed and said it is but they cant send proof .. but to accept the email and print it as proof .Should i accept this .Do HD ready tvs not state it somewhere that they are ?? Anyway the same tv is not ging funny with picture quality and i am not happy with it as it is almost brand new .I am going to get in touch with Argos to see if i can have a refund .It is over the 30 days but we will see eh ?