Defective Hisense Products

I purchased a Hisense television in August 2023. By the end of November the tv started giving problems. A technician was sent out, and the unit was replaced with a brand new unit in May. By September the second unit started giving the exact same problem as the first, of just switching off randomly. I once again called to complain. I was told that the warranty for a full refund had expired as the new unit continues from the initial date of purchase, and not from the replacement date. So they want to repair a brand new television of six months. How is this justified?