Bad bad bad service

I went to purchase a phone that is not network restricted and I was very specific about that. The phone does not have network on telcom. Now they are refusing to exchange it because they have opened it. If I did not explain when I bought the phone i would understand. Now the manager is telling me to call customer service, customer service is saying they must call the area manager. The manager is then refusing to call the area manager. I had to make my own means to contact the area manager. Then finally after 2hours. The manager then says to the cashier to only refund me and not sell me another phone..