Samsung - Samsung cheated me Ultra HD TV demage products

I am Pratap Sonkar, I had purchased Samsung ** inch Ultra HD *K TV from Varanasi on **.**.****, after ** days my TV started showing spots on the screen, after my complaint, my TV was returned and I got a refund coupon from the company. Samsung got my demand for money back but i got coupon after that i had option to buy samsung tv only then i purchased another model samsung ** inch ultra hd *k tv after that ** days again spot on tv After that I complained that the problem is visible in my TV, after that I demanded refund of my money, then they did not talk to me properly and kept saying that there is dust in the display, it will not change. Repair will be done after that no solution was found after talking for ** days then they said that if it is not correct then they will change the panel then they took my TV to the service center after repairing it and after * months spots all over the TV screen I complained after that There is dust in the TV, after calling him many times, he just changed my TV panel on **.**.****, from the next day of change, a black dot and a circle started appearing in it, then I complained, after that on **.**.**** I got a call and said that the company people are saying that the panel changes at * spots. I am very upset in one year. Samsung cheated me.