Bait and Switch - Trade in SCAM

I'm running into similar issues.  Was told "Sign up for the 5G service and everyone on your plan gets $830 credit towards a new phone with trade in".  Upgraded the plan, Bought the phone in the store and was told $7 month for 24 months after credit applied.  Paid taxes and fees (so I thought and I saw the charges) signed and went on my way.  Bought daughters phone over the phone and did same.  A day later check my account and not only is there a $130 down payment on there but $18 protection fee that I never asked for nor authorized.  More to the story with my daughters phone but The $11 that I was told hers would be monthly I am now being  told is $20 month.  There was no down payment on her phone but mine was cheaper and had a down payment.  In addition, the man working there told her the other guy "made a mistake" but there's nothing he can do.  Clearly they are trained to lie and steal from you since I found out only store employees make commissions.  

We have been with t mobile 16 years on auto pay and very loyal.  I usually get my phones at Apple but this promo sounded too good.  Now I know why.  The worst part is no one on t mobiles customer (joke) service line can tell my why this happened or why with our stellar credit and loyal account with them this happened.  I have received 6 different responses from 6 different people I could barely understand on the phone.  2 were supervisors.  The last response was basically go in the store and fix it.  Where is the service with this company??  Buyer beware and I can not believe I fell for this scam.  No wonder they are understaffed in the store as no decent person would work for a company that treats loyal long term customers like this and lies to their face about what they are buying and what it will cost.  Im disgusted and since our new plan doesn't start until the 23rd I am going to get my money back and cancel everything.  When 7 employees can not explain something as simple as buying a phone you know there's something rotten here.