Maintenance tech working on outdoor line my tv screen fried

Whether this is a warning to future or current customers, after a week of terrible service my final straw was today when an outdoor

Tech reconnected my outdoor line to my house, my previously working 1.5yr old $1000 LG tv went black. I thought maybe it was rebooting, nope I could hear sound, tv had faint glow. Quite literally while he was still outside standing at the outdoor box my tv was fried. Absolutely not a coincidence. He gave some [Edited: "Language"] about must have broke, well obviously but it was directly related to xfinity work. I told him not 1min ago tv was on and functioning and as soon as he was done my tv went black. He offered no explanation. I have seen this issue posted here, xfinity knows it's a possibility and problem. Also this is after the electric and xfinity wire fell from my house laid 25ft across my yard and we're in public road obstructing traffic, electric company was repairing within 20min, they left xfinity wire on the ground as they said liability is that xfinity handles their own wires. Xfinity couldn't come out for 2 days, Tuesday appt came no one showed, called complained gave us priority appt Wednesday, no one came, we called and xfinity told us they canceled the appt because the wrong tech was being sent out.they did not inform us, so I missed work and they canceled without telling me. Thursday appt finally happening, never was addressed or spoken to, he immediately began outdoor work, i could hear him tinkering through the wall directly where line comes in the house, tv went black only sound worked, he came into the house within 2min of outdoor completion and I told him my tv worked right until he was working on that box. He told me pretty much it was broken, but offered no help no explanation and obviously no responsibility that it worked up until the minute he touched my xfinity box connected outdoors to my house. He completely replaced wire from the pole on the street to my house and the loops inside the box and fresh coax, I clearly see the grounding wire in there too, i believe he knows he caused it, i have a feeling he touched up or 2 wires touched or even static that caused a surge that fried my screen. Inexperienced, incapable staff not trained to work anywhere near electrical, but the 2 usually run pretty close, i think he accidentally did it but still, he just left, however he sat in his van on the main road after leaving my driveway and parked next to the pole where he was working and was there a good 20min I think when he saw my tv fried he knew he may have done something to cause it, maybe he was checking the box out there or fixing something he realized he did wrong. I am furious. How do I prove my tv was totally fine and functioning and blew out the 2nd he touched my lines. He never came into the house 1st.