Not taking responsibility for an obvious issue

I bought a top of the range LG microwave from house and home in December 2019 the 2 year warranty ended in December 2021. In that time frame the microwave has been in for 3 major repairs. The 1st repair didn't upset me, life happens. When the microwave went in for the 2nd time for another big issue. I enquired as to what the procedure is on a return for such an item, I am not happy with the product as it is not performing as an LG product should. I was told that unfortunately nothing can be done until it comes in for a 3rd time. I was upset but accepted that. The microwave went in for it's 3rd major repair before the warranty ended in December 2021. The store and the LG service technicians insist that they find nothing wrong with this microwave. Luckily for me I took a video of what the microwave is doing. It is now going on two months with me not having a microwave and LG's service technician's insisting there is nothing wrong despite the obvious evidence on the video. House and home seems to have no pull on this cut and dry case. I feel that this whole process and game of back and forth is cheapening the LG name and making me very reluctant to purchase anything from both LG and House and Home in the future.