I'm so glad I went into a corporate store. I stopped at the tmobile closest to me and the guy said "well we can do everything a corporate store can do"........ well not really buddy since you sent me on my way to deal with it myself
At this store, I explained to Alondra that I purchased the iPhone 8 from T-Mobile's website and realized I should have ordered the Plus with the larger screen for my aging eyes. She was on it right away! She called tmobile and confirmed that I could ship back the 8 and get refunded the amount I paid online. She got a return shipping label for me (even printed it). And had the iPhone 8 Plus in the silver that I wanted. Got my new phone running with the application of the protection screen and sent me on my happy way!!
I realize any store could have done this but the key is making a customer FEEL like you're helping them solve their problem. Kudos to this store that figured it out!