Sony bravia - Display panel probelm

I have bought sony led **x ****f on *-**-**** after * months I having display problem.having ink dots which spread on display in some months,so i complained for this issue and my problem was solved on **-*- ****.but after * months i have same problem with display having ink dots on display on some area.i complain on ** september **** in coustmer care.My concern is i have got replaced display in warranty, at that time i asked can i extend my warranty sony executive said after * year you cannot extend warranty.now i have same problem on led,its just * months when i replaced display panel do this is counted still in warranty if not then why do i buought sony led tv if this cant even long last for * year,it display is corrupted * times in ** months.my neighbour bought mi tv of price ** thousand and i bought sony tv **x kd ****f of mrp ** thousand still mi tv gave no issues to coustmer and sony tv which is big brand and high price tv which u want that this tv long last so I had paid more for this tv in comparision to mi tv so i get better service and also thought it would long last.but its dissapointing to having issues with sony tv in just ** months even after paying so much money.I am from middle class family i waste my saving on this waste brand sony .i regret why i didnt but low budjet tv who long last and also cheap in price .