On Us with AirPods promotion & rebates

It was a black friday promotion, get free air pods or pay the difference for airpod pro.  I called about why I have a device installment on my bill for Airpod pro.  I paid the difference the day of the purchase, since i did not get regular airpods. Nobody mentioned the fact that I needed a rebate to not have to pay for the amount that was left.  This was not sent in a text or email.  So I called T-mobile today and she gave me the information on the promo rebate and I submitted it.  After I submitted the rebate- the dates to submit were from 11/19/2021 to 12/27/2021.  The rebate was received at T-Mobile onn 1/1/2022.  Not sure if the promotion dates are for the dates of purchase or dates of submission.  Not very clear on website for the rebate.  Many other issues with t-mobile today, on a 2 hour call and waiting for a subpervisor to call me back.