Hisense tv

I purchased a flat screen Hisense tv in may 2018. It has been for repairs once, on the second time, I was told that it cannot be fixed but will replace will replace it with a brand new model smart tv in May 2020. I did ask the salesman before picking up the new tv that i will now start my warranty again, he said yes cause it's an upgraded model. Well and good, fast forward, the tv has been for repairs twice for lines on picture. On the third time, there was no picture, took it to MasterCare Durban for repairs November 2022 only to be told that the warranty has expired. So Hisence tv gives you 4 years, so why with MasterCare do,this........