Being charged for device tmobile received but cannot locate

This is unbelievable! I switched to T-Mobile from Verizon back in July and did the trade in upgrade  promo. I sent my iPhone 12 Pro 256gb, got the tracking and the phone was DELIVERED.
Something wasn't right with my bill so I contacted them and asked if they have received the phone and they said yes they have received it and it will reflect on my bill in the next month or two and I will be credited for the difference. That didn't happen so I called again and they manually lowered my bill to what I agreed to pay for one month and the next month it's shot back up so I contacted them again. I went back-and-forth with multiple calls for hours, and they filed a "T-Mobile Handset Order Research Request". They claimed that they received something because USPS said it was delivered then came back and said it was an empty box. The interesting thing is that I got an email this morning regarding the "T-Mobile Handset Order Research Request" and they put a request in for the WRONG PHONE! They put a request in for the IMEI of new phone I'm using. Class action lawsuit sounds like what needs to happen. I contacted T Force through X/Twitter and am waiting to see if they can make this right… if not, I'm dropping T-Mobile and will put them on blast on all social media sites, warning people! I'm told you can take the phone to the T-Mobile store now for them to send it… imaging that! I wasn't offered that service in July. Be careful everyone.