Google Pixel XL 9 Backordered

I have ordered Pixel 9 Pro XL for my wife on 11/24/2024 by trade in my old phone. While ordering, T-mobile was showing me that the mobile will be shipped in 2-3 days.  After a week, I called to T-mobile customer service and they said that it is out of stock in warehouse and they are waiting for google to deliver the stocks to tmobile in this week. He has promised me on call that, phone will be shipped and deliver to you by 12/6/2024. I am using T-mobile from last 13 years and having 10 lines group from last 10 yrs. As a courtesy, They have provided $50 for late delivery and promised that you will get mobile phone by 12/6/2024.

Today i called to t-mobile customer service and representative is telling me that the mobile phone is out of stock and they can't do anything till 12/24/2024. 

I asked them to bring supervisor on call but he is denning it. I asked him to create a complaint and provide me complaint no, He is saying no there is no way to do complain too. He will only capture the note and someone will read and if appropriate then they will call me. 

It is really frustrated to see the  "Pixel 9 Pro XL" available on amazon, google website and they are ready to deliver in 2-3 days and T-mobile is saying that, They dont have a stock and they are unable to do anything more than a month.

Is there any way to raise a complaint?