I had sent my old device iPhone 6 Plus to Tmobile for a trade in credit. The tracking # showed Tmobile warehouse already received it but no credit was issued. I have been contacted customer service so many times and they said they didn't receive the

‌I am so sorry to hear that. I think Tmobile is robber they tried to steal customer's phone that's why they didn't resolve our issue. I lost my phone and they are not responsible for it even though UPS had proof of delivery. All they said to me is they could find the phone with that IMEI number. I believed that there are a lot Tmobile's customer are their current victims. 😠