Malfunctioning brand new tv

I bought a JVC 58" 4k smart tv december last year, had a lightning power surge in February and claimed from insurance, they provided me with the same model, i would have wanted the option of cash but they did not offer that to me as i wasnt happy with the quality of the tv. Many of the popular apps like dstv now we not able to download, when using netflix the tv would just get stuck while the audio works in the backround but the tv screen is black, when i switch it off with remote the light goes red but tv screen stays on. Then the tv just malfunctioned one day it stopped working when switching the tv on it would go from the startup screen to black then blue. Continued like this for a few weeks, i contacted new age group the insurance supplier, for they sent a technician out, he checked said its software, came back next day to install new software still didnt work. Then again and again and agaim same issue. Then it worked for a weel then same issue i called the same technician he came out again after hours he installed mew software no luck. He then changed the motherboard, stil no luck he then changed it to a aiwa motherboard the tv worked and i could upgrade youtube, previously couldnt and wasnt able to use the app. Today back to square one, faulty again. this tb not even a year old and these problems weeks without watch tv. I just want them to take this tv i want my money back. It clearly is not able to function properly. I dont want new software or a new jvc my money back so i can get a working tv.