Go to Which website. They have a letter format you can use. I did this and it triggered a response from John Lewis who checked my past orders and found that I had an extended 5 years warranty! The TV is 4 years and 10 months old! They arranged collection and repair. The engineer knew exactly what the problem was as soon as he saw it. He said it is common for Samsung and LG TVs to have this LED coating failure. It is now back and working well but Samsung were appalling. Never again will I buy one of their sets.
I agree with you. I got lucky with John Lewis- see my other post but it doesn’t absolve Samsung of responsibilities for a poor component in an otherwise good product nor their uncaring attitude. I did get them to respond via Twitter before I had the set repaired by John Lewis. I shall now get back to Samsung on Twitter to try to keep up the pressure in the hope that they might help others less fortunate than myself.
You must go back to the retailer. Paul has provided lots of information on this elsewhere in the thread. The retailer is responsible under consumer law. No need for an expensive engineer report either. Just take a clear photo of the screen showing the purple patches.