You should call LG customer support. Not the repair people. They are not authorized to deal with it, until they get ordered to do so by LG Customer Service. Written documentation is fine, but it also allows them to pick and choose how they want to deal with you.
It has gotten you no where. For cripes sake; call the LG Customer Service people, and start having some real time conversations with them.
Be polite, and just explain to them what the problem is, and would they please send out a service person to fix it.
Stop sending in video clips, and relying on online communications. You are just hurting your chances. Call LG Customer Service. That is what it is set up for. Do not dialog online with them. Talk to them on a real phone; you know, where you can respond, and they can ask questions, on a real time basis.
Perhaps you should have your wife make the call, since you may bring too much emotional baggage, from the past history, into play.
You have nothing to lose. If you get no the first time. Call back at a different time of day. Calling customer service is like rolling dice. Keep calling until you get someone reasonable on the phone. Of course you or your wife should make sure to sound very calm and reasonable.
Customer Service phone staff get shouted at a lot, so they appreciate it when someone treats them in respectful and courteous manner.