International roaming charges

I called a week before I travelled and after two hours of arguing why I shouldn't have to pay until I travelled, they agreed it was $10 per day per phone when used. While traveling for 4 days they sent me a notice that I was up to $270 in charges. When I called they said it was only applied to one phone and not both. I argued and they told me it was because my wife failed to respond to a text they sent about the charges. She thought it was a scam, since they didn't sene one to mine and we had already set it up. Spent and hour on the phone, the 2nd agent agreed that it wasn't right and escalated to his support team. They said no! I asked to speak to his manager and he said he was the one who refused. This seems like they are purposely trying to cheat people. They also refuse to provide any backup information. Anybody know of a person that I can speak to that can help out?