Good thing I'm a hoarder of receipts and correspondence when it comes to matters like this:
In August of 2016 I upgraded from a Samsung Galaxy S7 Edge to a Note 7 (which is also gone now). I'm a Jump on Demand customer. Being well-aware of the time constraints in returning trade-ins, I immediately sent the S7 Edge back to T-mobile using the SASE provided with the Note 7. I kept the USPS tracking number handy and even took a photo of the SASE. Per the USPS tracking website, the phone was delivered and accepted by T-mobile or one of its agents on August 22, 2016.
Doing a little "self-audit" of my bills dating back to September 2016, I see monthly charges of $30.00 for the trade-in. I naturally phoned T-mobile support and was advised that they would be investigating the issue and issuing one credit of $30.00 toward my current bill.
What's alarming about this is, 1) had I not kept a record of the return I would be royally screwed and 2) I provided the tracking number to the agent with no assurance of protocol given to determine return status. I am due credit in arrears of $180.00.
This all seems a bit fraudulent given that I even phoned T-mobile last September 2016 when I noticed no trade-in credit was given for the S7 and at that time the agent assured me that I had nothing to worry about and that it would "clear itself up" soon.
Any others deal with this?