I am getting ripped off on roaming. Please help with advise

Here is what happened: I have 500 min. nationwide family plan with T-mobile, with unlimited call between the 2 cell phones. My teenage son was traveling overseas about two months ago and I wanted him to have a cell phone with him. I called cust, service rep to see what are the options for international use, activation etc. The rep told that it was possible to modify my plan so that I could make a call to the second cell phone overseas, and it still would count as cell phone-to-cell phone call within the States and there would be no roaming charge. However, there would be charge per min. if my son would call me from abroad to my phone in the States. To make long story short, I have two bills with roaming charged of approx. $600. They charged me for every call that I made form my home in the USA to my son abroad. I specifically asked the rep if there would be a charge under any circumstances for a call placed from USA and he told me there would be no charge under any circumstances. Needless to say, all calls and a letter to T-mobile customer service relations were fruitless.
My question is: What are my options? I am prepared to take this issue as far as I can. I am just wondering where I have to begin. Should I go to public defender or arbitration first? Many thanks

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Call a lawyer and have him get in touch with t-mobiles legal department, they'll bend or break, if everything you say is true.

well, to tell you the truth, any phone call received or sent from the phone overseas is going to be charged the international roaming rate either way, there should be no extra charges on your bill however, since you were calling your son's local number, and mobile-to-mobile only applies when one t-mobile user calls another t-mobile user on t-mobiles u.s. network, it says specifically on the contract. What the rep told you wasn't true, i would call customer care again, ask to speak with a supervisor, and let them know that it was their rep's misinformation that caused you to have that outrageous bill, and that had you known the proper charges, you would not have made those calls, good luck and keep us posted!

I have to agree with Vid, I have often reviewed memos left by previous reps to verify that they did indeed tell you that a price was what it is (hope this makes sense) I used to alwys document stuff like this is its a CYA type thing.

While I am no longer in customer care.. I am still a customer..