Request to unlock the device and contact the expert without providing a solution

I have understood and reviewed the unlocking regulations and requirements multiple times, and have also communicated with T-mobile experts. Every time, they are very certain that the device meets the requirements and wait for 72 hours to complete the unlocking. However, after 72 hours, I did not unlock and called to inquire about the reason. If I still repeat the previous expert's operation, my heart is also broken! Tried by T-mobile experts time and time again