Go to whoever supplied TheMarket with the TV or the local repair agent. Cut out TheMarket.
I had issues with a Samsung screen purchased from well known PC retailer - they didn't want anything to do with it (Until I "screamed" CGA at them but by that point I had given up on them doing anything), so I went direct to Samsung who just asked why I didn't deal with the retailer, gave them my story and they took in the screen and did the work no problem.