Oneplus — One Plus TV Y series (43 Inch)

I bought one plus TV on 13th Jan through their website. I got the delivery and then after a week their technician came for the installation but was not able to install the TV properly then again after a week another person came and did something and then said that TV wifi is not working, contact to the customer care. Then I post the complaint about that but still not getting any solution. And when I called them they says that we will replace the part in one week. When I am paying full money then why I am getting demaged product. I asked them for replacement and they says we wont provide you the replacement. Is it not like the cheating the customed by selling them damged product with taking full amount.