T-mobile T-mobile using bait and switch tactics Internet

I pay 99.99 for an unlimited talk and text plan, I added a third phone to my account and when I did I verified that it would be under the family plan and was told yes it would be.  Today I called about a problem with the new phone and when we got that fixed the rep stated that the she noticed that the phone only has 500 minutes a month and to add unlimited minutes and text it would be 25.00.  When I talked to a supervisor I told him that their employee verified that this phone would be covered under my current plan.  I still had to pay 25.00 more for unlimited talk and text on the new phone.  I have been a t mobile customer from 10 years but will drop them as soon as my contract is up.