2020 Samsung TV 5 year warranty being denied

Hi all, so my 3 year old 75” QLED has developed a black line across the entire width of the screen about an inch up from the bottom of the screen, I’m 110% certain the tv when on display had the 5 year warranty included (as did my previous Samsung LED) 

I’ve just been to Currys and they said it never had 5 year cover, I know for certain it did and I distinctly remember asking at the time of purchase which was confirmed correct, as I’m very cautious when spending large amounts of money 🤣 

So Its not looking very good for me getting it sorted I’ve got to ring Samsung support in the morning but feel I will be wasting my time, so almost £2000 for a to which has failed at 3 years old,  I’m not impressed.

Any help much appreciated 

Thanks