Agent Lied - Promotion Not Honored

Called to update internet speed, from 500mpbs to 1000mpbs. Asked about any promotional offers as ours had ended, we were looking into other internet services. First representative I spoke to almost scolded me for thinking other internet providers were comparable, and basically told me to do more research then call back? I then called back 12/6 at 1:16PM. I spoke to another agent after discussing with my brother what would be best and he said we could just update the speed, seemed easier. I asked again about promotions. I was told that there was a promotion and could get $40 off internet service if I switched to Xfinity mobile. I told her I wanted a new phone anyways and our T-Mobile bill had gone up after adding additional lines, I was interested would think and go to a store the following day. I went into a store 12/7 at 12P. I opened an Xfinity mobile account and transferred all 4 lines from T-mobile. Since doing so, 3/4 lines didn't work appropriately, my new phone is hardly working well, won't even receive the messages Xfinity is sending for account verification. No promotion was applied as the rep I spoke to 12/6 didn't disclose that all had to be done at once, so there was no code on my account. Store employees said call customer service again, ask them to apply code. Mind you, I had to go to the store 2x as after my phone started to somewhat work, when I left wifi and attempted to make a call, there was an automated system saying that I had an outstanding balance and needed to make a payment, my service has been disabled.... So at 7:30PM I went back to the store. The store was closed but luckily some staff were still there and one was able to call customer service and figure out why the phone wasn't working. They had to delete the e-sim and restart. I called customer service last night and today, was told the rep I spoke to didn't document conversation, not sure how this is my fault, but she should've said all needed to be do ne at once, well.. she didn't, and they couldn't put promotion on account because the computer wasn't prompting it. At this point, I still have only 2 partially functioning phones. Advised if promotion wasn't honored, or alike applied, then I wanted the restocking fee waived for devices (only got 2 new devices, one free and one almost free) and would cancel Xfinity mobile. The rep I spent 30 mins talking to then said he could transfer me to Xfinity mobile rep. 

At no point was I offered for the phone call from 12/6 to be listened to, Xfinity records all calls, or given any additional resolution. I now have poorer cell service, less premium data, and am paying more per line than I would be with T-Mobile, AND lost out on other streaming perks, all for a promotion that would've made our monthly expenses more reasonable, that will not be honored. This has been an incredibly frustrating process. Please be cautioned.