Can I buy iphone 5s full price in tmobile?

Couple days ago i try buying a iphone 5s full price, 400 cash and the rest my credit card. However the guy in tmobile said i could only put down 400 and come back the next day and pay the rest and take my new iphone 5s. Can do that? I have tmobile account i just wanted to upgrade a new phone?

Split payment method. Happens all the time. Can't imagine why you were told that. Best luck.