Why am I charged for long distance charges?

I am currently travelling abroad and within the first week, I pocket dialed my wife. It was gut wrenching but I was ready to live up to my mistake and pay the $15. After that, I made sure to put my phone on AIRPLANE Mode and today when I look at my bill guess what happened. I have been charged for 4 × $15 for days I didnt use my phone. I need to know why you guys are trying to back stab a loyal customer. I am trying to talk to customer service on live chat, since I am out of the country, but with no success. What can I do?