To the point:
Packaged equipment per instructions and dropped off to UPS with pre-printed label.
Equipment delivered to T-Mobile.
Charge shows up months later for unreturned equipment.
They will not resolve.
A happy customer with a different service provider as of today for all personal and business lines, and waiting with all documentation and tracking info to have the negative entry removed from my credit report when it appears.
This has happened to others here, so I advise caution to all when returning equipment. Keep all documentation and tracking numbers, as you may end up needing it to remove collection accounts because T-Mobile’ warehouse clowns lost your return. Or maybe warehouse gremlins ate it?
So long, T-Mobile!