The T-Mobile unlock lie

The drama continues. I finally got a response from T-Mobile due to my FCC complaint on 1/4/2024. Of course, they first asked me to add another $100 in refill (despite my $220 I already paid). A few hours later I received this from T-Mobile:

I want to apologize as I am not having the same issue with any other customers today. I wanted to update you on the progress and solution that I currently have to offer.

The IMEI that you have provided is not able to be unlocked, even with an override. Regardless we would like to offer you the device that you currently possess with an unlocked version. The issue that I see is that you are out of the country. If you have a stateside address that I am able to ship the device to, we will be able to ship the device today. We would request that the current device you have is sent to our office in good condition.

We are able to offer a refund of the device as well if the device is shipped back to our office however we would ask that the device is returned to us before. Please let me know how you would like to proceed.

So T-Mobile confirms that there is something wrong with their unlocking system.  The replacement/refund sounds good, right? Not for me after all the troubles I had with T-Mobile. So I replied on 1/5/24:

Unfortunately, your two proposals do not solve my problem. I can of course give an address in the US, but I need the device here and it is of no use to me 6000 miles away. I will gladly contribute to the shipping costs if that is the problem and return the locked device as soon as possible.

After 22 weeks of waiting and trying, $220 in refill, countless promises and assurances by T-Mobile to no avail, hours spent with support, it takes a little more than a few lines in an email to restore my trust in T-Mobile.

I therefore suggest that T-Mobile refund 50% of the price ($550) now and I return the device at my expense (please provide the address) as soon as I received the partial payment. Once T-Mobile has received the device, I will be refunded the remaining amount. 

I asked twice for a shipping address by e-mail. More than a week passed and no reply from T-Mobile ever since. What a "a total experience that includes best-in-class, personalized support from T-Mobile experts when needed" (https://www.t-mobile.com/customers/customer-care).

If someone at T-Mobile reads this and finally intends to deliver on their promise: you will find my e-mail address in my account. Feel free to get in touch with me. Gracias.