I had a repair guy come and he's like yah I'll

I had a repair guy come and he's like yah I'll update the chip in your 46" samsung T.V. He leaves and also breaks my Hdmi cable to my xbox, but my parents said they'd pay cause he "fixed" it and then I arrive home from school to see that my T.v Has the same problem. The guys clearly a fuckin ******. basically what happens is the T.V has vertical colored lines go across the screen and you can't see the picture. Then it tries to fix itself by turning itself off and on. The white light at the bottom of my t.v flashes like 5-7 times then the tv turns back on sometimes it does the same process after it has turned itself off. Also sometimes it will come back on and the picture will be clear sometimes for 10-30 secs other times for like 5 minutes then repeats the same process of turning itself on and off. Please help thank you.