We have replaced 2 sets of patio doors, one window...

We have replaced 2 sets of patio doors, one window and an entry door in our apartment with them back in 2015. We received a lifetime warranty for all above. The windows and patio doors we ordered were supposed to be the best availabvle and we did pay a lot for that. Last year, I noticed 2 of the patio doors getting foggy on the inside (1 in dedroom and 1 in living room set). I called the company, I believe every other week for 2 weeks. I kept on leaving the message on the service department voicemail. I usually called them when I got back from work, around 4PM. Everytime I was told to leave a message or to call back when the service person was in (9AM-2:30PM). She never called me back, at some point I was driving by their shop and stopped in- nobody there to help me. Left a message again. I believe someone from service department finally called me back, 1 or 2 days after I stopped by. I told her what was wrong, they had info on file, they ordered the doors and I had to wait around 3-4 weekd to get them replaced. I had to pay $150 for the service. The replaced door did not fit very well in the living room- was very hard to move (sliding door), was very sqeeky- was told to use WD-40 or call to have itr replaced again.... The doors were replaced end if March 2019.
And now, February 2020, I called them again- the door from bedroom that was replaced last year, and the door next to it got foggy on the inside. AGAIN. Very frustrated by the quality of it!! So I called last week and left a message. Monday- no call. Call again- leave a message- no call back. I Call again Wednedsay- a very nice lady picks up- tells me I have to leave a messge in the service department for I belive Merry? I said that I already did, twice, and nobody called me back. Then she tells me that her work hours are Mon-Fri 9AM- 2:30PM. I asked why she doesn't return her calls? She coudn't answer and said I need to call during Merry's (?) working hours or leave a message. So I choose to leave a message and set up a reminder on my phone to call the office during her work hours. Nobody called me on Thursday. OK. Friday 11AM- I call- she doesn't pick up. I leave a message. And now I am writing this review. I am beyond frustrated. This is the worst customer service ever! From what I read they will harrass every potential customer with phone calls to have them purchase with EuroTech and when you actually have paid thousands of dollars, and the product received is defective, not only they will not answer your calls- they won't even call you back! This is just plain ridiculus! I will be trying to call them again and again- we will see when and if (!) I will be able to get any help...