Bought my 55KS9000 from John Lewis in store in May 2017. I emailed customer services to complain on Tuesday 3 July using billinghams letter as a template but not word for word, they emailed me the following day saying they had passed on the complaint to the store. The store called me on Friday to say they have the complaint and said they will consult with the Samsung rep, I then informed them my complaint was with them for mis-selling and not Samsung, Samsung was their problem. They rang back on Monday 9 July offering a refund for in store credit which I accepted, I'll be taking the KS9000 back and will replace it with the LG B7.
billinghams letter https://eu.community.samsung.com/t5/TV-Audio-Video/KS-Owners-refund/td-p/358805/page/95
Regarding John Lewis it seems people are having more luck if they bought the tv in store.
