I was refused service at a Samsung Service Center

A few days ago, I went to a Samsung Service Center in Incheon to get my laptop repaired, but my request was refused.

1. When I visited in early October, I couldn't get a repair because they said there were no laptop engineers available. Visitors ended up heading to nearby Samsung Service Centers instead. I only found out after checking the notices.
2. I visited again a few days later. Even though I arrived at 5:40 PM at a location that closes at 7:00 PM, I was refused service once again. The kiosk was completely blocked off, and when I asked, they told me they weren't accepting new requests even though it was 1 hour and 20 minutes before closing time. They only then explained that same-day registration wasn't possible, and everyone was giving me dirty looks because they just wanted to go home.
3. An engineer finally came out so I could barely register, but I didn't even receive the KakaoTalk registration notification...
   Normally, I receive both a notification and a paper receipt, but there was no notification. I had to deal with their attitude even while paying, and I waited without even knowing if my registration went through ㅠㅠ
4. When I went inside the repair area, staff members who were about to leave were chatting and laughing about their personal lives, and some seemed to be filming the interior, including me, with their phones. It felt terrible.
   Even if I arrive 1 hour and 20 minutes before closing,
   do they really give customers dirty looks and refuse registration just because the staff wants to leave? It is truly disappointing that they didn't even give me a receipt and were just chatting and filming videos among themselves.