On Us with AirPods promotion & rebates

I switched from Sprint to T-Mobile and upgraded to 4 IPhone13Pros.  I got the AirPods on us promotion and asked all the questions because I seem to get burned every time I upgrade.  Now they are telling me that only 1 of the AirPods are eligible for the rebate.  Not one person that I talked knew this.  The first person told me that that were all free all I had to do was pay the taxes.  Another person told me after I saw the charges on my bill, that I will be credited double next billing cycle.  We got disconnected in the middle of this conversation and she never called back.  The next person then tells me that I have to apply for the rebate and didn't even know that until she was reading it as we were talking.  She was disappointed herself because she got the AirPod promotion for her family.  Then she tells me that I have to do a rebate for all 4 AirPods.  While trying to apply for rebate which was not working she reads further and says that I am only getting the rebate for 1 of the AirPods not all 4. So I ask for a supervisor because I am furious at this point.  Well the supervisor said that I to send the other three back if I don't want them and only because I didn't open the boxes. The one box that I opened can not be returned.  Trust there's more to this saga because I was on the phone for hours.  I trusted that the sales persons knew what they were doing and I didn't have the promotion in front of me, however I asked them to tell me everything I need to know because I have been burned before. So if I ask you to tell exactly everything that I need to know then don't lie to me with a bait and switch. I didn't want to go with T-Mobile because of their reputation, however I think all of these carriers have bad reputations.  I still can't believe this happened because I spent so much time asking all the questions from the beginning.  I was on the phone so long that the salesperson gave me a curtesy credit for taking so long.