No problem!
It is the WORST not knowing where it is. I was more upset over not knowing, than the money itself honestly. I was even looking into my options as far as hiring a lawyer and whatnot. How is it fair for me to pay for 7 months, when even TMobile didn't even know where it was? I saw , like you did, that I definitely wasn't the only one. To add insult to injury, they had FORCED me to mail it via USPS when I begged and pleaded to be able to take it into a store or use UPS for the return. I had no faith in it from the beginning. They also told me tracking was useless anyway, because they don't have proof that it wasn't just an empty box, a broken phone, or not the right phone. It's like "no ****! That's why I wanted to bring it into the store!" I waited until the 16th to order my 7+ this year, until I received multiple guarantees from multiple T-Mobile supervisors that I could, in fact return my 6s+ in-store.
It's totally ridiculous. They don't seem to care this year either when I told them of my experience.
It's good that you contacted T-Mobile early on and persistently, so that they have record that there was no delay in your return of it. Each call is logged in your account. Take care and good luck. They WILL get your money back to you at some point as a bill credit.