Phone missing

I ordered 2 new phones with new service on April 27th and when I got the delivery on May 2nd, only one phone was in the box. I called and was told I would hear back in 48 hours. I didn't hear back so I called and was told 15 days plus I would receive a credit. I called back in 15 days and was told a couple more days. I called again and was told a FedEx claim was never submitted even though I was told it was. Then a few days after that I was told to submit a police report, so I did that and was told another 5 days. On that day I called again and was told that my claim was completed and I would receive an email the following Monday (May 29th) telling me when the phone would be shipped out. HOWEVER, I got an email on Sunday stating that my claim was denied........I called back today and whoever I talked with wouldn't give me any information about why my claim was denied and refused to transfer me. I was told I would get a phone call within 72 hours from a different department so I asked for the phone number for this department because everytime I was promised a call back, I haven't received anything. However when I googled the phone number "David" gave me, it was the same number I've been calling. I've called about 12 times and have been on the phone for over 6 hours with probably around 20 different people with Xfinity mobile at this point. I need to know what to do. I don't even care about the credits I was promised and never received, I just want this phone sent to me and I don't want to be lied to anymore. Every single customer service rep I've talked to has lied and given me different information, whether it be credits promised, time frames, they lied about the FedEx claim being done when it wasn't, lied to me when I was told my claim was completed and I would be sent the phone......... Is there a corporate number I can call? How do I get this escalated especially when I've been told with almost every phone call that it has been escalated?