I asked for coolant flush, but service offered was coolant exchange?

Hi I brought my 2013 Kia Soul (2.0 liter, 60,000 miles) to a tire shop called Point S. On the phone, I asked for a coolant flush, and made an appt for today. When I got there to check in, the board displaying their services said it was a "coolant exchange". I questioned him about whether it was a flush or an exchange, and he said on certain vehicles certain things on the engine get in the way of them doing a coolant flush, and so in that case it becomes a coolant exchange. I wasn't satisfied with this explanation so I cancelled my appt til such time I have a better understanding. I then called an auto repair shop, and asked if coolant flush and coolant exchange were basically the same thing. He said, no. I asked which do you do? He said coolant flush. But his price was basically the same price as Point S. ($150). So I'm pretty much confused now. Can anyone help me out here. I am getting really tired of signing up for one service, and getting something different. I want to be an informed customer.