Samsung poor quality product run around

I bought a Samsung tv a year and a half ago. This is a 58 inch Smart TV with which I have been very happy with but a year after the purchase the tv starting giving problems and was subsequently booked for multiple repairs and issues. Just yesterday my tv was fetched again and booked in for the 4th repair and this time with a different repair center who will attempt the repair. The last three repairs left me without a tv for a month. At which point does Samsung either replace the tv completely or give me my money back. This is ridiculous!! Clearly the time and money spent to do the repairs are not working and Samsung is just sorry all the time. I am not happy because I paid a lot of money for this product.