Luggage Replacement Issue With Turkish Airlines

During my flight with THY, I went to the ground service because my medium-sized suitcase arrived with broken wheels and several damaged parts. Since they didn't have a medium-sized suitcase available, they gave me a large one. I emptied my entire suitcase and transferred everything to the new one. Just as I was about to leave, I noticed the wheels of the new suitcase were faulty and reported it. They gave me another new suitcase, and I repeated the same process. There were no issues until I exited the airport, but as soon as I stepped outside, the same problem occurred with this suitcase. The brand-new suitcase they provided was defective. Despite reporting this, I was told that since I had already been given a suitcase, nothing could be done, and the matter was closed.
On my next flight, I had to travel with the faulty suitcase. When I returned and went to the ground services again, no action was taken. They noted that the suitcase was of the same brand and had the same issues, and a new report was filed. I sent an email with the report, explaining the situation again, but I was once more told that nothing could be done. I found this approach unacceptable for a globally recognized company like THY.