Switching from Tmobile to AT&T

Thanks! What I needed to know.

I was on my husband tmobil account where he still have 4 lines active, he removed my cell account and we changed it to att. We had a att representative explained to us that ATT will pay up to $600 toward my tmobil device. Att has my tmobil device, since this deal was done in February. And now I have a ATT device. We summited the last bill from tmobil to get out gift card to pay off my tmobil bill but we had been told by the store representative and your phone representative that since the tmobil  bill shows the word REMOVE and not the words FINAL BILL we are not getting our gift card to pay off the tmobil bill...we had tried to explain over and over again that tmobile CAN'T give  final bill because there are 4 other active lines in the tmobil account. We had called ATT and gotten the response of "oh well too bad to sad if the bill doesn't read final bill the deal will not apply to you", a very unprofessional answer. Our sales associates was very pleasant but she at all times knew that there was 5 lines a tmobil because at 2 different times she tried to get us to switch all 5 lines to ATT and I strongly feel that she should had advised us that we were going to run into this problem. My switch or tracking number is 827726324. I'm very disappointed with this situation and I feel it is a scam. I had sign up to twitter to start letting people know that switching from one cell company to ATT is not a good idea since what was promised is a scam and a lie. I'm also thinking about letting the better business bureau know that not only ATT has other political problems, they are also ripping off their customers...If you would like to reply to my concerns and keep me a loyal customer I will look forward to listening to you. Thank you