Plasma Unit

I bought a Plasma unit end of December 2020 and in March I complained about the poor workmanship on it. I bought it at Rochester North Gate where I was given an email to send my complaint but I didn't get a reply. I complained again in September I sent everything they asked but my complaint was rejected and I didn't know about it until I called. I lodged another complaint and it was rejected and they say that the Supplier is rejecting saying that it's over a year of which I started to complain in March 2021, September 2021 and November 2021 and even now one year is not yet over but they don't want to fix my Plasma unit. They only respect customers when they are buying but when they are complaining they don't want to help. I am still at the same place where they delivered the unit they would say that I damaged it by moving.